Rocks Unit Test Study Guide
Three Types of Rocks
How do they form?
How is each type classified?
Igneous
from magma or lava
that cools & hardens
intrusive & extrusive
What would you for look when
trying to classify a rock?
large crystals or small crystals
Three Examples
Metamorphic
heat & pressure
foliated & non-foliated
bands or no bands
gneiss, slate, quartzite
Sedimentary
weathering, erosion,
deposition, compaction &
cementation
chemical, clastic & organic
parts of other rocks, plants &
animals in layers (strata)
sandstone, coal, limestone
granite, obsidian, rhyolite