Rock Types
This type of rock forms when magma cools and hardens.
Igneous
The process that breaks rocks into smaller pieces.
weathering
Fossils are these of ancient living things.
remains or traces
Minerals are naturally occurring, solid, inorganic, and have this structure.
crystal structure
The building blocks of rocks.
minerals
This type of igneous rock cools slowly beneath the surface.
intrusive
The process that moves sediments to new locations.
erosion
Fossils that lived a short time but are found over a wide area are called…
index fossils
How hard a mineral is measured with this scale.
Moh's hardness scale
Molten rock beneath the surface.
Magma
This type of igneous rock cools quickly on the surface.
extrusive
Sediments being pressed together to form rocks is called…
compaction and cementation
This type of age tells which rocks/fossils are older or younger.
relative age
The way light bounces off a mineral is called…
luster
Molten rock that reaches the surface.
lava
Rocks formed from sediments pressed together are called…
sedimentary
Sediments being laid down in a new location is called…
deposistion
This type of age tells the exact age in years.
absolute age
The color left behind when a mineral is rubbed on a plate.
streak
Layers of rock, often visible in sedimentary rocks are called
strata
Rocks changed by heat and pressure are called…
metamorphic
The law stating older layers are on the bottom and younger on top.
law of superposition
The dating method often used to find absolute age.
radioactive dating
Minerals break this way, smooth or jagged.
cleavage or fracture
Sedimentary rocks formed from remains of living things also known as...
organic