Earth & Environmental Sciences
cratering
87%
impact structure
86%
crater
63%
geological mapping
22%
melt
20%
fill
17%
periglacial process
14%
crater lake
12%
last glaciation
11%
oasis
10%
anhydrite
10%
heat source
10%
hydrothermal system
10%
laboratory research
10%
sedimentary sequence
10%
lacustrine deposit
8%
colonization
8%
Eocene
8%
stratigraphy
8%
preserve
8%
pond
8%
silicate
7%
calcite
7%
Miocene
7%
dating
7%
glass
7%
melting
7%
erosion
6%
habitat
5%
sampling
5%
rock
4%
material
3%
Physics & Astronomy
cratering
100%
craters
75%
impact melts
32%
oases
15%
hydrothermal systems
15%
stratigraphy
14%
habitats
12%
lakes
11%
dating
11%
calcite
10%
sediments
10%
heat sources
9%
erosion
8%
silicates
8%
rocks
8%
sampling
6%
melting
6%
rings
5%
glass
4%