Geology Questions and Answers

Geology

Humans can affect weathering (breaking down of rock/soil) in several ways. Humans cause increases in acid rain and pollution, which increase the amount of weathering agents in the air and water,...

Latest answer posted November 14, 2008, 8:41 am (UTC)

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Geology

There are generally two versions of the answer to this question. The first is the more general about 70% of Earth is water while about 30% is land (US Geological Society). The second is the more...

Latest answer posted January 25, 2014, 12:39 am (UTC)

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Geology

Sial refers to the earth’s crusts upper layer, it is made up of rocks abundant in silicate and aluminium based minerals. The word Sial itself is an amalgam of the first two letters of aluminium and...

Latest answer posted September 30, 2013, 11:46 pm (UTC)

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Geology

The Earth has been around for about 5 billion years, and has about another 5 billion years to go. It has been cooling since its formation, and its surface temperature has stabilized within about...

Latest answer posted November 23, 2009, 1:15 am (UTC)

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Geology

The 3 types of tectonic plate boundaries are convergent, transform, and divergent. A convergent boundary is one where two plates are moving toward each other. Typically one plate is forced...

Latest answer posted November 18, 2008, 10:23 am (UTC)

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Geology

As we dig deeper into the earth, we notice that temperatures rise approximately by 30 ºC for every kilometer that we descend. Temperatures in the Upper Mantle of the earth can reach up to 1,400 ºC....

Latest answer posted August 17, 2019, 6:48 am (UTC)

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Geology

From a scientific point of view, rocks are essential trace fossils. A trace fossil is a type of imprint that reflects an animal's behavior. Some of this behavior is imprinted on fossilized rocks....

Latest answer posted December 11, 2009, 3:54 am (UTC)

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Geology

Almost one-third of Earth’s surface is desert -- that is, area that gets less than 10 inches of rain each year. These areas have what’s called a moisture deficit: they lose more moisture through...

Latest answer posted January 10, 2009, 7:55 am (UTC)

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Geology

In strictly volcanic terms, they are two different kinds of depressions. A caldera is formed when a large eruption of magma, or lava, leaves a gigantic empty chamber underground. The volcanic...

Latest answer posted December 30, 2010, 5:42 am (UTC)

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Geology

I assume that the data in your assumes it would take 2.1 x 10^6 years for the Pacific Plate to move the 181 km distance from Kauai to Oahu. If so, then: 1 km = 100,000 cm = 10^5 cm 181 km =...

Latest answer posted April 29, 2009, 11:58 pm (UTC)

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Geology

Gravel is formed of rocks that are unconnected to each other. While common perception of gravel is smaller rocks anywhere between one and three inches around, official designation of gravel...

Latest answer posted September 9, 2012, 6:38 pm (UTC)

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Geology

The main type of energy that is used to convert metamorphic rocks into igneous rocks is heat. Metamorphic rock can only be converted into igneous rock by being melted and, thereby, made into magma....

Latest answer posted February 2, 2010, 2:01 am (UTC)

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Geology

When you are looking at exposed layers of rock, as on the side of a cliff, the layers are usually just that--lines of rock, one on top of another, over long periods of time. Each layer is generally...

Latest answer posted November 14, 2009, 1:03 am (UTC)

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Geology

Plants can cause both mechanical and chemical weathering. Mechanical weathering occurs when roots grow and cause the rock to break (just like the roots that crack the sidewalk). Chemical...

Latest answer posted October 28, 2008, 10:08 am (UTC)

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Geology

We see granite everywhere. We see it as counter tops in many kitchens and we see it as flooring in many homes. Granite can be used indoors or outdoors because it is so resistant to cracking,...

Latest answer posted December 12, 2009, 12:01 am (UTC)

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Geology

Clouds start forming when the temperature equals the dew point. Given the air temperature and relative humidity, the dew point can be calculated as: Td = T - ((100-RH)/5) = 29 - ((100-50)/5) = 29 -...

Latest answer posted March 29, 2015, 2:05 am (UTC)

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Geology

The Tropic of Cancer and Capricorn are imaginary lines of latitude running parallel with the Equator. Both are 23.5 degrees north and south of it, Cancer in the north, Capricorn in the south, so...

Latest answer posted November 23, 2009, 10:13 pm (UTC)

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Geology

A particularly fascinating region of the Earth, the Ring of Fire is a series of volcanoes and extremely active seismic activity resulting from the plate tectonics prevalent around the perimeter of...

Latest answer posted September 25, 2013, 2:29 pm (UTC)

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Geology

The Earth has its color because 70% of the earth’s surface is covered by water. Our oceans and other bodies of water appear blue because of the way our sunlight is scattered as it goes through our...

Latest answer posted December 11, 2008, 8:43 am (UTC)

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Geology

In a word, erosion. The action of the weather on exposed rock surfaces exposes them to water in its various states (solid ice, liquid water, and if you deep enough underground where the...

Latest answer posted November 24, 2008, 8:19 pm (UTC)

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Geology

Depositional environments are the geological environments where particular types of sediments are deposited. Geological processes will later work on these sediments to convert them into rocks (a...

Latest answer posted July 3, 2013, 1:35 am (UTC)

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Geology

Volcanoes may serve as land building events. The Hawaiian islands were formed as lava from volcanoes from deep under the ocean's surface erupted and the magma cooled and increased the height of the...

Latest answer posted October 3, 2012, 9:44 pm (UTC)

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Geology

South America's land mass constitutes 12% of the overall land mass of the world. This makes South America the fourth biggest (and the fourth smallest) of the world's seven continents. The biggest...

Latest answer posted November 21, 2009, 11:02 am (UTC)

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Geology

We hypothesize, based on geology, that there were prior supercontinents. The Earth's crust is constantly in motion, rearranging and reshaping itself. Based on our current understanding of the age...

Latest answer posted January 15, 2014, 5:23 pm (UTC)

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Geology

The science of plate tectonics has explained the slow motion of the continents over time, since the Earth cooled and the first land masses appeared. Alfred Wegener (1880-1930) noticed that South...

Latest answer posted December 28, 2011, 2:47 am (UTC)

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Geology

On the Earth Science Reference Table if you look at Inferred Properties of Earth's Interior on page 10, you will see that the temperature of the Asthenosphere or Plastic Mantle as it is also known...

Latest answer posted January 7, 2012, 10:57 am (UTC)

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Geology

Studying layered sedimentary rocks is precisely the point of geochronology. Geochronology, of course, is the scientific practice of studying rocks and fossils for the purpose of determining their...

Latest answer posted September 13, 2013, 2:50 pm (UTC)

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Geology

Waterfalls can happen in any part of a river's system where massive erosion or an abrupt steepening of the river's channel exists. Waterfalls are very erosive. The power with which the water pours...

Latest answer posted June 16, 2012, 5:46 pm (UTC)

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Geology

In the stratosphere, oxygen can exist as ozone, or O3. Different wavelengths of ultraviolet (UV) light help combine and dissociate the ozone molecule by adding or removing atomic oxygen:O + O2 +...

Latest answer posted November 25, 2008, 6:23 am (UTC)

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Geology

Tropical rainforests, which are located near the equator in parts of South America, Central America, Mexico, the Caribbean, parts of Asia and Africa and Australia have warm temperatures that...

Latest answer posted April 15, 2012, 2:39 pm (UTC)

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Geology

No, the stone around which Jerusalem's iconic Dome of the Rock was built is not a meteorite. The stone, which has been given so much significance by Muslims and Jews, is part of a simple bedrock...

Latest answer posted December 28, 2009, 10:05 am (UTC)

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Geology

Sedimentary rocks are a type of secondary rock because they are made of materials that have already been used as a part of rocks, plants, or animals. These usually accumulate as they are washed...

Latest answer posted June 7, 2008, 5:29 am (UTC)

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Geology

The movement of these plates (there are about 20 of them) is significant to us today mostly because it is their movements that cause earthquakes. The lithospheric plates are the plates that are...

Latest answer posted November 4, 2009, 11:08 am (UTC)

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Geology

One of the most important places in the United States where two plates are sliding past each other is in California along the San Andreas Fault. This fault line slices California in two. It begins...

Latest answer posted May 27, 2009, 11:44 pm (UTC)

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Geology

In Earth science, porosity refers to the empty spaces in a rock. If the grains in a rock are well sorted meaning they are almost all the same size, it will have higher porosity than a rock with...

Latest answer posted February 2, 2012, 7:39 am (UTC)

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Geology

On a shoreline where there are different types of rocks, some more and some less resistant to erosion, sediments such as sand and silt will be carried away, leaving behind the more resistant rocks....

Latest answer posted January 21, 2012, 9:05 am (UTC)

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Geology

Not only dinosaurs, but all living things either evolved or extinguished. Periodically, the Earth goes through a time of a "Great Die-Off," where the environment is so quickly and radically...

Latest answer posted November 17, 2009, 1:15 am (UTC)

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Geology

During a year with the El Nino effect, there is warming of the surface waters in the eastern Pacific Ocean and the pressure is high in the western Pacific. The opposite is true in years when the...

Latest answer posted January 30, 2010, 9:54 am (UTC)

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Geology

29.22% of the earth's surface is land. 70.78% of the earth's surface is liquid water. Most of the earth's water is salty or permanently frozen. Approximately 3% of the 70.78% of earth's surface is...

Latest answer posted June 4, 2009, 4:59 am (UTC)

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Geology

The temperature of the earth's core is so high mainly because "it contains radioactive materials which release heat as they break down into more stable substances."...

Latest answer posted November 9, 2008, 3:17 am (UTC)

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Geology

To begin with, geology is the study of the earth. This includes rocks, minerals, and everything they make up, such as the earth's crust, fossils found in the earth's crust, and the results from the...

Latest answer posted April 4, 2016, 3:04 am (UTC)

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Geology

The Earth’s lithosphere, which is the crust and upper most part of the upper mantle, is broken into tectonic plates which float in the more viscous asthenosphere, which is the remaining part of the...

Latest answer posted December 24, 2010, 1:10 am (UTC)

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Geology

One major difference between oceans and land occurs in their respective crust formations. Oceanic crust is in a constant state of renewal. New crust material forms out of ocean vents where the...

Latest answer posted November 12, 2012, 8:37 pm (UTC)

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Geology

The asthenosphere is a part of the Earth's upper mantle. The asthenosphere lies underneath the lithosphere which is the Earth's rigid plates (plate techtonics). In a sense, the lithosphere floats...

Latest answer posted February 25, 2010, 3:30 am (UTC)

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Geology

According to Webster’s Dictionary twilight is the diffused light from the sky during the early evening or early morning when the sun is below the horizon and its light is refracted by the earth's...

Latest answer posted November 23, 2008, 12:12 pm (UTC)

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Geology

The current version of the Earth's crust dates back about 225 million years, to the time of Pangea ("all earth.") That super continent has since broken up, and the fragments moved around the...

Latest answer posted May 16, 2011, 7:21 am (UTC)

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Geology

A cone of depression occurs solely in locations where there are wells, so they'll only be found on land. Normally the water table, the constant water level underground, sits at a certain depth...

Latest answer posted June 25, 2013, 7:16 am (UTC)

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Geology

Rainbows have been known for all of history, but the first scientist to describe them analytically was probably the Iraqi physicist Ibn al-Haytham. The first scientists to correctly identify the...

Latest answer posted October 24, 2008, 8:51 am (UTC)

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Geology

Convection is a term used to describe the movement that results from the heat at the core of the Earth moving through the layers of the lower and upper mantle to the surface of the planet. As any...

Latest answer posted August 28, 2012, 5:36 pm (UTC)

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Geology

Japan has a lot of earthquakes because there's this giant catfish curled up under the islands and when it moves, earthquakes happen... NO, of course not, but that's an old Japanese myth. The real...

Latest answer posted October 24, 2009, 11:19 pm (UTC)

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