Earth & Environmental Sciences
platinum group element
100%
siderophile element
52%
Cretaceous-Paleogene boundary
34%
Younger Dryas
32%
impactor
31%
cratering
29%
extinction
28%
crater
27%
Cretaceous
20%
chondrite
20%
iridium
19%
iron meteorite
19%
iron
18%
transition
17%
flood basalt
17%
mass extinction
16%
asteroid
14%
Paleogene
14%
material
13%
volcanism
13%
impact structure
12%
mass spectrometry
11%
ejecta
11%
plasma
10%
anomaly
10%
lithology
8%
nickel
8%
sediment
8%
impactite
8%
assay
8%
marine record
7%
planetary surface
7%
suevite
7%
sulfide
7%
biochemical process
7%
geological process
6%
Deep Sea Drilling Project
6%
acid digestion
6%
Ocean Drilling Program
6%
isotopic ratio
6%
basin
5%
vaporization
5%
remobilization
5%
methodology
5%
bioturbation
5%
background level
5%
infill
5%
physical process
5%
reworking
5%
Earth science
5%
rock
5%
Chemistry
Inductively Coupled Plasm Mass Spectrometry (ICPMS)
14%
Fire
10%
Trace Metal
5%