Geology 101 with Willsey, Episode#16: Metamorphic Rocks
24:29
Geology 101 with Willsey, Episode #17: Relative Dating Principles
16:50
CRITÈRES de RECONNAISSANCE d'une MÉTÉORITE.
21:41
Rock Identification with Willsey: Foliated Metamorphic Rocks - Slate, Phyllite, Schist, and Gneiss
19:17
Rock Identification with Willsey: Nonfoliated Rocks - Quartzite and Marble
29:58
Geology 101 with Willsey, Episode #21: Fossils
14:15
San Andreas Fault in Mecca Hills: Outstanding Geology At Every Turn
10:19
200 Earth Impact Craters Mapped by Size and Age
24:19