Igneus, Sedimentary, and Metamorphic Rocks Study Guide Flashcards
Rocks that form when magma or lava cools and gardens are called _____________ ___________.
Igneous rock
What is the melted rock called that is beneath the earth’s surface?
Magma
How does magma reach the earth’s surface?
By going through vents and channels
What builds up inside the earth and forces magma upward?
Preashure
Materials from earth that people use are known as _______________ _________________.
Natural resources
What is magma called when it leaves a volcano?
Lava
Magma slowly ___________ and ______________ under the earth’s surface.
Cools and hardens
What type of rocks would you expect to find around volcanoes?
Igneous rocks
Granite is an example of what kind of rock?
Igneous rock
What igneous rock has a glassy surface, sharp edges and was used by the American Indians for arrowheads?
Obsidian
Granite is formed from cooled _____________.
Magma
The Hawaiian Islands are made of what kind of hardened lava.
Basalt
What igneous rock is formed from trapped gases when a volcano explodes?
Pumice
Scientists layers in ______________ rocks to piece together earth’s history.
Sedimetary
What kind of rocks form when bits of rocks and minerals are compacted and cemented by earth’s processes?
Sedimentary rock
When the weight of water and air above the sediments press the sediments together this process is called ____________.
Compaction
What is the process called that slowly cements layers of sediments together and form rock?
Cementation
What two factors change rock into sediments?
Wind and water
What two factors change lower layers of sediment into rock?
Compaction and cementation
Rock salt is an example of what kind of rock?
Cedimentry rock
