Earth & Environmental Sciences
aerosol
21%
ash
12%
asteroid
33%
barrier island
16%
climate
25%
climate change
12%
climatic effect
13%
comet
55%
cooling
21%
crater
43%
cratering
20%
Cretaceous-Paleogene boundary
29%
dating
10%
Deccan Traps
13%
dust
13%
eccentricity
17%
effect
11%
ejecta
12%
explosive
15%
flood basalt
42%
glaciation
11%
global climate
9%
greenhouse effect
10%
gymnosperm
10%
Holocene
20%
hot spot
9%
ice
15%
ice core
9%
indicator
10%
magma
12%
mass extinction
99%
ocean
25%
periodicity
33%
Permian
39%
Permian-Triassic boundary
29%
planet
10%
sea level
27%
seafloor
9%
solar system
24%
submergence
11%
sulfur
12%
transgression
10%
Triassic
18%
volcanic eruption
100%
volcanism
47%
winter
10%
Physics & Astronomy
aerosols
18%
Antarctic regions
6%
asteroids
17%
basalt
6%
carbon dioxide
9%
causes
8%
climate
8%
comets
26%
cratering
11%
craters
18%
Cretaceous-Tertiary boundary
9%
cycles
13%
domes
5%
dust
6%
estimates
6%
exobiology
7%
extinction
27%
galaxies
7%
geomagnetism
5%
global warming
8%
greenhouse effect
7%
heating
5%
ice
5%
impactors
5%
magma
7%
Oort cloud
5%
periodic variations
6%
plumes
10%
sea floor spreading
5%
sea level
5%
solar system
10%
stratigraphy
7%
sulfates
6%
volcanic eruptions
42%
volcanology
25%
winter
5%