Rock Types
Igneous
Igneous rock that remains in a pocket below the surface, cools slowly, and has a coarse-grained appearnce. (Choices: Intrusive, Extrusive, Foliated, Unfoliated)
Intrusive
This very hard, metamorphic rock that began as shale and has leaflike layers. (Choices: Marble, Sandstone, Gypsum, Slate)
Slate
This cave formation occurs when stalactites and stalagmites come together to form a solid pillar from the top to the bottom of the cave.
Column
Rock that is formed from sand and mineral fragments that have been pressed together.
Sedimentary
The most common igneous rock that can be found everywhere on land. (Choices: Obsidian, pumice, basalt, granite)
Granite
This metamorphic rock that began as limestone is one of the most beautiful and widely used. (Choices: Marble, sandstone, gypsum, slate)
Marble
Troglophile
Rock that has been changed by extreme heat or pressure into a new kind of rock
The sedimentary rock formed by chemical sediments and is used for salting roads and flavoring food. (Choices: Obsidian, halite, basalt, granite)
Halite
This type of rock consists of rounded pebbles in hardened clay or sand.
Conglomerate
This term refers to the study of caves
Speleology
Over 75% of the earth's surface is covered in this type of rock.
Sedimentary
The sedimentary rock used to make glass. (Choices: Conglomerates, breccia, sandstone, shale)
Sandstone
Where does the earth's magnetic field come from?
How does it remain "magnetized"?
From currents of electricity that circulate in earth's outer core.
Because of increasing electric currents deep within its core.
A _____ cave is formed by the dissolving of underground rocks by water.
Solution
This type of igneous rock is formed at the earth's surface, cools rapidly, and has a fine-grained appearance. (Choices: Intrusive, Extrusive, Foliated, Unfoliated)
Extrusive
The sedimentary rock that is the only stone formed by living animals. (Choices: Chalk, breccia, reef limestone, gypsum)
Reef limestone
Explain how a solution cave is formed.
Is this an example of physical or chemical weathering?
Rainwater picks up carbon dioxide as it passes through air and soil. It forms a mild acid. Limestone absorbs the water and dissolves. The water drains and leaves a cavity in the rock.
Chemical weathering
This animal visits a cave regularly but must return to the surface for food.
Trogloxene