Earth Science, Geologic Time & Fossils

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

Contrail

Definition & Facts

Perlite

natural glass

Cordaitales

fossil plant order

Echinosphaerites

fossil cystoid genus

Undertow

hydrodynamics