Earth Science, Geologic Time & Fossils

Charnockite

rock

Szaibelyite

mineral

Geologic Time

Periods, Time Scale, & Facts

Antimony

Symbol, Uses, & Facts

Cyathocrinites

fossil echinoderm genus

Gelisol

soil

Cystiphyllum

fossil coral genus

Reflection Seismology

Bauxite

ore

Silt

sediment particles

E Region

atmospheric science

Davis, William Morris

American geographer

Basalt

Properties, & Facts

Pliohippus

extinct mammal genus

Electrum

alloy

Trilobite

fossil arthropod