Rocks
This kind of rock forms when molten rock cools and hardens
Igneous Rock
Name two forces that cause Metamorphic Rocks
Heat and Pressure
Many sedimentary rocks contain these preserved remains of ancient plants or animals, what are they called?
fossils
Fast cooling lava can form glassy igneous rock with tiny or no crystals - what is the name of this rock?
obsidian
These rocks are made from pieces of other rocks or remains of plants and animals.
Sedimentary Rocks
What does the word metamorphic mean according to the text?
to change form
How are sedimentary rocks produced?
by the weathering of old rocks, the loose grains of sediment are deposited and then compacted/cemented together to create layers
Do igneous rocks that form deep within Earth's crust cool slow or fast?
slow
Rocks changed by heat and pressure are called this.
Metamorphic Rocks
The originally rock from which a metamorphic rocks forms may be....
any type - igneous, sedimentary or metamorphic
What are characteristics sedimentary rocks often have?
striped layers
Rocks that form at the surface are known as......?
extrusive igneous rocks
Name the continuous set of processes that change rocks from one type to another (melting, cooling, weathering, compacting, heating, pressure)
The Rock Cycle
Gneiss
What is sediment?
pieces of rock, sand, and dirt
Give 3 examples of igneous rocks according to your text.
Granite, Basalt, Obsidian, Pumice