Chapter 7 Earth's Rocks
A natural, solid substance that has a definite chemical composition and physical structure.
|Igneous rock|| |
Rock that forms when melted rock cools and hardens.
Magma that is exposed at Earth's Surface
|sedimentary rock|| |
Rock that forms when layers of sediment settle and are cemented together
Melted rock within Earth
|metamorphic rock|| |
Rock that forms when igneous, sedimentary, or metamorphic rock is changed by pressure, high temperature, very hot water, or a combination of these factors
The process by which metamorphic rock forms.
|rock cycle||processes that change rock from one type to another type|
The bottom layer of soil, made mostly of solid rock
The top layer of soil, made in part from broken pieces of lower layers of rock
|Cave Crystals|| |
Minerals grow as crystals. If there is enough space they can grow to be as large as 3ft. in diameter and about 50 ft. long.
|Rock layers||The Grand Canyons dramatic drop provides a cutaway view of this.|
|Carved by Water||...Over thousand of years, erosion of the rock by the Potomas River has caused the Great Falls to move 9 miles upstream.|
|Ancient Secrets||In the 1400's the Inca people of the Andes Mountains used terraces to grow 20 varieties of corn and more than 240 varieties of potato. The terraces prevented rain from eroding what little good soil there was in the high mountains.|
|What effect do high temperature and pressure have on igneous rock?||They change igneous rock to metamorphic rock.|
|What characteristic of soil might be most important to farmers?||the amount of water it can retain|
|What best explains the glassy look of obsidian?||It cooled very quickly|
|A way that layers of sedimentary rock bind together?||by pressure|
|a cause of regional metamorphism||mountain building|
Flickr Creative Commons Images
Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.
- "Mineral" image
- "Igneous rock" image
- "lava" image
- "sedimentary rock" image
- "magma" image
- "metamorphic rock" image
- "metamorphism" image
- "bedrock" image
- "topsoil" image
- "Cave Crystals" image
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