Classifying Rocks
A person who studies the history of the earth through rocks and rock formations.
Geologist
Igneous rocks can be _______________ or ________________(2)
extrusive or intrusive
Sedimentary rocks form when sediment if deposited by _____________ and _____________.
water and wind
Coral animals produce _____________ that grow together to form coral reefs.
skeletons
These two things can change any rock into a metamorphic rock.
Heat and pressure
Rocks are made of ___________________?
Minerals. (Atoms is also acceptable)
Extrusive rock is igneous rock formed from ____________.
Lava that erupted onto earth's surface.
In layers of sedimentary rock, where would you expect to find the oldest sediment?
On the bottom
Coral animals absorb________________from the ocean water.
calcium
Rocks that have their grains arranged in parallel layers or bands are said to be this.
Foliated Rocks
Geologist observe the _______________ and ____________ of crystals in a rock to identify the minerals that the rock contains.
Shape and color
Intrusive rock is formed when_____________ hardens beneath the earth's surface
magma
People use sedimentary rocks for (2 reasons)
acceptable answers, tools, building materials, weapons
True or false. Coral animals grow best in cool water.
False, they grow best in warm tropical water.
Foliated or splits easily into flat pieces.
______________give the rock its texture.
Grains
Most of the Earth's minerals contain____________.
Silica
Sedimentary rocks are formed through these 4 processes.
erosion, deposition, compaction, cemetation
What are two states in the United States that have coral reefs?
Florida and Hawaii
These metamorphic rocks have their grains arranged randomly.
non-foliated rocks
These are the 3 groups of rocks.
Igneous, sedimentary,metamorphic
Igneous rocks are classified according to ___________, ____________ and___________. (3)
origin, texture, mineral compostion
The three types of sedimentary rocks.
organic rocks, clastic rocks,chemical rocks
These deposits provide evidence of past environments.
Limestone deposits
What would happen if an igneous rock were under intense heat and pressure?
It would change to metamorphic---or-- the crystal structure, the appearance, and other characteristics would change.