Earth Science- Rocks Flashcards
(35 cards)
What is an Extrusive Rock?
they cool fast
What is the most common intrusive rock? Where can it be found?
Granite and mountain ranges
What is the most common extrusive rock? What is it mostly made out of?
Basalt and the earths crust
What is a porphyritic texture?
Larger crystals scattered on a background of much smaller crystals,
What type of rocks do intrusive rocks have?
Large crystals
What type of crystals do extrusive rocks have?
Smaller crystals
What does low silica indicate?
dark colored rocks
What does high silica indicate?
light colored rocks
What igneous rock is considered volcanic glass?
Obsidian
What igneous rock is used for cleaning and exfoliating your feet?
Pumice
Do igneous rocks react with acid?
no
Order that forms sedimentary rocks
Erosion
Deposition
Compaction
Cementation
What is erosion
when forces are constantly breaking up and wearing away rocks
What is deposition?
when sediment settles out of water or wind carrying it
What is compaction?
The process that presses sediments together.
What is Cementation?
When minerals in the rocks slowly dissolve in the water
What are the 3 groups of sedimentary rocks?
Clastic
Organic
Chemical
What are the two types of Igneous rocks?
Intrusive
extrusive
What is an intrusive rock?
They cool slowly
What is a clastic sedimentary rocks?
Rocks that form when rock fragments are squeezed together
What is an organic Sedimentary rock?
forms where remains of plants and animals are deposited in thick layers
What is a chemical sedimentary rock?
Forms when minerals are dissolved in a solution crystallize
What is coal formed from?
Swamp plants buried in water
Where do metamorphic rocks form?
under the earths surface
