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- Ballard, Robert Duane (1942- )
- Banded Iron Formations
- Barrier Islands
- Barringer Meteor Crater
- Basalt
- Basin and Range Topography
- Batholith
- Bathymetric Mapping
- Beach and Shoreline Dynamics
- Beaufort Wind Scale
- Beaufort, Sir Francis (1774-1857)
- Becquerel, Antoine-Henri (1852-1908)
- Bed or Traction Load
- Bedding
- Bedforms (ripples and dunes)
- Bedrock
- Beebe, Charles William (1887-1962)
- Benett, Etheldred (1776-1845)
- Benioff Zone
- Berner, Robert A. (1935- )
- Bernoulli, Daniel (1700-1782)
- Bernoulli's Principle
- Bessel, Friedrich (1784-1846)
- Big Bang Theory
- Biogeochemical Cycles
- Biosphere
- Blackett, Patrick Maynard Stuart (1897-1974)
- Blizzards and Lake Effect Snows
- Bohr Model
- Bohr, Niels (1885-1962)