Subject
Geology
57
Earth sciences
56
Earth (Planet) Surface
31
Earth movements
31
Seismology
31
Earth (Planet) Mantle
27
Physical geology
19
Earth (Planet) Crust
16
Geology, Structural
16
Lithosphere
16
Earth currents
15
Geodynamics
15
Earth (Planet) Environmental aspects Study and teaching
13
Environmental sciences Study and teaching
13
Human beings Effect of environment on
13
Geography
10
Physical geography
10
Environmental sciences
8
Natural resources
8
Landforms
6
Water use
6
Biotic communities
5
Ecological regions
5
Ecological zones
5
Weather
5
Biology
3
Earth (Planet) Internal structure
3
Earth (Planet) Orbit
3
Evolution (Biology)
3
Historical geology
3
Life sciences
3
Oceanography
3
Plate tectonics History
3
Volcanoes
3
Animal diversity
2
Animals
2
Atmosphere
2
Biodiversity
2
Meteorology
2
Vernal equinox
2
Zoology
2
Agricultural education
1
Agronomy
1
Air Pollution
1
Astronomy
1
Astrophysics
1
Blizzards
1
Civil engineering
1
Climatic changes
1
Climatology
1
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