Earth & Environmental Sciences
platinum group element
100%
impactite
51%
crater
41%
chondrite
37%
impactor
36%
impact structure
35%
deep drilling
28%
Eocene
27%
siderophile element
26%
meteorite
25%
asteroid
23%
Cretaceous
23%
rock
22%
extinction
22%
iron meteorite
21%
isotope
20%
Younger Dryas
20%
melt
17%
parent body
17%
fossil record
15%
stable isotope
14%
Cretaceous-Paleogene boundary
14%
cratering
14%
project
13%
mass extinction
13%
isotopic composition
13%
solar system
13%
transition
13%
ejecta
12%
chronology
12%
stony iron
12%
flood basalt
12%
mass spectrometry
12%
olivine
12%
plasma
11%
eukaryote
11%
stony meteorite
11%
isotopic ratio
11%
biogeochemical cycle
11%
drilling
10%
shell
10%
astronomy
10%
tektite
10%
bivalve
10%
geochemistry
10%
iron
9%
calcite
9%
Paleogene
8%
carbon isotope
8%
Bronze Age
8%
geology
8%
trace element
8%
paleoclimate
8%
stalagmite
7%
Antarctica
7%
volcanism
7%
aquatic ecosystem
7%
clay
7%
oxygen isotope
7%
endosymbiont
7%
material
7%
basin
7%
chemostratigraphy
7%
Barents Sea
6%
fractionation
6%
dolomite
6%
metal
6%
iridium
6%
comet
6%
lithology
6%
fossil
6%
ice field
6%
quarry
5%
provenance
5%
strontium
5%
plate tectonics
5%
sediment
5%
Archean
5%
isotopic analysis
5%
Deep Sea Drilling Project
5%
salinity
5%
cave
5%
environmental conditions
5%
carbonate
5%
limestone
5%
Physics & Astronomy
impact melts
30%
projectiles
28%
chondrites
25%
rocks
22%
fossils
21%
platinum
19%
eukaryotes
15%
chronology
13%
planets
11%
Ghana
10%
oxygen isotopes
10%
craters
10%
chemistry
9%
plates (tectonics)
9%
oceans
9%
asteroid belts
8%
prokaryotes
8%
solar system
7%
bombardment
7%
general overviews
7%
signatures
7%
meteorites
7%
geology
6%
geochemistry
6%
continents
6%
Cretaceous-Tertiary boundary
6%
jacks
6%
lithology
5%
magma
5%
ecosystems
5%
carbon isotopes
5%
interrogation
5%
mitochondria
5%