Earth & Environmental Sciences
Archean
5%
asteroid
18%
astronomy
13%
breccia
8%
Bronze Age
26%
chondrite
48%
chronology
14%
clay
15%
comparison
7%
cooling
8%
crater
83%
crater lake
5%
cratering
15%
Cretaceous
11%
Cretaceous-Paleogene boundary
14%
detection
5%
disequilibrium
6%
drilling
8%
ejecta
23%
endosymbiont
5%
Eocene
20%
eukaryote
9%
extinction
21%
flood basalt
12%
fossil
5%
fossil record
15%
geochemical method
18%
geology
12%
glass
5%
heat production
7%
impact structure
52%
impactite
28%
impactor
20%
iron
7%
iron meteorite
24%
isotope
7%
isotopic analysis
14%
isotopic ratio
11%
lead isotope
18%
lithology
8%
mass extinction
20%
mass spectrometry
8%
material
13%
melt
46%
metamorphic feature
6%
meteorite
26%
ocean
5%
paleoceanography
5%
paleoclimatology
5%
Paleogene
5%
petrology
12%
planetary surface
16%
plasma
11%
plate tectonics
9%
platinum group element
76%
program
5%
provenance
16%
raw material
9%
relative abundance
5%
rock
32%
siderophile element
7%
solar system
12%
suevite
16%
trace element
5%
transition
12%
volcanism
9%
Younger Dryas
13%
Physics & Astronomy
asteroid belts
17%
astronomy
6%
biology
6%
bombardment
7%
breccia
11%
chemistry
18%
chondrites
40%
chronology
14%
continents
6%
craters
26%
dating
5%
drilling
8%
Earth surface
8%
ecosystems
5%
eukaryotes
12%
fossils
20%
general overviews
5%
geochemistry
6%
geology
8%
Ghana
21%
igneous rocks
5%
impact melts
100%
impactors
9%
inductively coupled plasma mass spectrometry
5%
interrogation
6%
jacks
6%
lakes
11%
lithology
10%
magma
5%
meteorites
11%
mitochondria
5%
Namibia
20%
oceans
11%
petrology
21%
planets
10%
plates (tectonics)
17%
platinum
29%
projectiles
56%
prokaryotes
6%
rims
5%
rocks
54%
signatures
7%
solar system
6%
spherules
19%