Types of Rock
A solid mass of minerals or mineral-like materials.
What is a rock?
The picking up and carrying away of sediments.
What is erosion?
Melted rock that reaches the earth's surface.
What is lava?
Rocks that contain minerals that are oriented perpendicular to the direction of greatest pressure.
What is foliated metamorphic rock?
A model that describes the ways in which rocks transform from one type to another.
What is the rock cycle?
When an agent of erosion, such as water, wind, ice or gravity loses its energy and drops of its sediment load.
What is deposition?
Melted rock that remains underground.
What is magma?
Rock that lacks a layered or banded appearance.
What is nonfoliated metamorphic rock?
Rocks that form from layers of weathered, eroded, and deposited sediment.
What is sedimentary rock?
Any process that breaks down rock.
What is weathering?
Igneous rocks formed from magma beneath the Earth's surface.
What are intrusive igneous rocks?
The process by which rocks change from heat and pressure.
What is metamorphism.
Rocks that form from cooled magma or lava.
The process that squeezes, or compacts, sediments.
What is compaction?
Igneous rocks formed from lava at Earth's surface.
What are extrusive igneous rocks?
The most important agent of metamorphism.
What is heat?
Rocks that form when preexisting rocks are altered by pressure, heat and/or fluids.
What are metamorphic rocks?
This takes place when dissolved minerals are deposited in the tiny spaces among sediments, binding them together into a solid mass.
What is cementation?
The rate of cooling affects the size of these.
What are crystals.
Hot liquids that may dissolve minerals within rocks.
What is hydrothermal?