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Extrusive rocks are... extruded... onto the surface as the lava that we all think of. It cools fairly quickly, into rocks with fairly small crystals (might need a magnifying lens to see them). The exact chemistry of the parent magma will determine the type of rock. Oceanic volcanoes are generally basaltic (mafic or ultramafic), continental are generally granitic (felsic or intermediate). They're put down in "relatively thin" layers
Intrusive rocks cool for thousands of years beneath the surface in huge plutons or batholyths. This allows them to grow very large crystals (easily seen by the unaided eye). These intrusive rocks are almost always granitic-type rock.
My sources are:
from my science teacher who worked at the science museum
yahooanswer.com
ask.com
wikipedia the free encyclopedia
I hope this information helped. Good luck!
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoThey are different because Igneous rocks are......
- They are volcanic rocks.
- Their are only two ways they are made.
- Plus they are not broken rocks.
They are also different because Sedimentary........
- They are sexy
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Are sedimentary rocks are harder than igneous rocks?
No, igneous rocks are harder than sedimentary rocks on average.
How do igneous rocks from into a sedimentary rock?
igneous rocks mix with metamorphic rocks and they combine together to make a sedimentary rock. the three themes of science rocks are metamorphic,igneous, and sedimentary.
What percent of rocks are metamorphic sedimentary or igneous?
53% igneous, 23% metamorphic, and 24% sedimentary
More often than metamorphic or igneous rocks sedimentary rocks have what?
Sedimentary rocks have numerous fossils
Are unakite rocks Sedimentary rocks Metamorphic rocks or Igneous rocks?
metamorphic
How does the volume of sedimentary rocks in Earth's crust compare with the volume of igneous rocks in the crust?
75% Igneous 5% Sedimentary
What are three types of rocks?
igneous, sedimentary, metamorphic
Are sedimentary rocks are harder than igneous rocks?
No, igneous rocks are harder than sedimentary rocks on average.
Can Metamorphic rocks can form from igneous but not from sedimentary rocks.?
Metamorphic rocks can form from both igneous and sedimentary rocks
Can metamorphic rocks can form from igneous but not from sedimentary rocks?
Metamorphic rocks can form from both igneous and sedimentary rocks
How do igneous rocks from into a sedimentary rock?
igneous rocks mix with metamorphic rocks and they combine together to make a sedimentary rock. the three themes of science rocks are metamorphic,igneous, and sedimentary.
Can metamorphic rocks form form igneous but not from sedimentary rocks?
Metamorphic rocks can form from both igneous and sedimentary rocks
What are 3 major rock types?
Igneous Rocks,Sedimentary Rocks,Metamorphic Rocks.
Name the 3 kinds of rocks?
There are three major types of rock: igneous (formed from the cooling and solidification of magma or lava) sedimentary (laid down as sediments) and metamorphic (changed by heat and/or pressure)
What is the name of all three rocks sedimentary igneous and?
Sedimentary, igneous and metamorphic.
How are igneous and sedimentary alike?
Both are composed of minerals. Some sedimentary rocks contain pieces of igneous rocks.
How are metamorphic rocks igneous rock and sedimentary rocks different?
Metamorphic rocks originate as igneous and sedimentary rocks, but have been changed by heat and pressure.
