Subject
Earth sciences
7
Geology
7
Erosion
6
Ocean
5
Plate tectonics
5
Continental crust
4
Continental drift
4
Earth (Planet)
4
Earth (Planet) Core
4
Earth (Planet) Crust
4
Earth (Planet) Surface
4
Earthquakes
4
Glaciers
4
Groundwater
4
Mountains
4
Rocks
4
Volcanoes
4
Faults (Geology)
3
Minerals
3
Geophysics
2
Ocean bottom
2
Seismology
2
Accretion (Astrophysics)
1
Astronomy
1
Beaches
1
Coasts
1
Continental shelf
1
Deserts
1
Floods
1
Fossil fuels
1
Geological time
1
Igneous rocks
1
Loma Prieta Earthquake, Calif., 1989
1
Mars (Planet) Surface
1
Metamorphic rocks
1
Natural resources
1
Ocean wave power
1
Oceanography
1
Orogeny
1
Paleomagnetism
1
Pangaea (Supercontinent)
1
Petroleum as fuel
1
Petrology
1
Renewable energy sources
1
Richter scale
1
Rivers
1
Sea-floor spreading
1
Sedimentary rocks
1
Sedimentation and deposition
1
Venus (Planet) Surface
1
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