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Why are there are almost no extrusive ultra basic rocks in earths crust?

There are almost no extrusive rocks on the earths surface because they are all under the earths surface. They are mainly lower than the earths surface.


Intrusive igneous rocks form when hardens and cools beneath Earth and surface.?

The substance that cools beneath the earths surface when an intrusive igneous rock forms is Magma. Magma is a molten material made up of rocks and minerals.


What do you call the molten rocks under the earth surface?

Molten rocks under the Earth's surface are called magma. When magma reaches the Earth's surface, it is then called lava.


What is the complete predicate in volcanoes are places on the earths surface where molten rock gases and ash from deep inside the earth are ejected?

"are places on the earth's surface where molten rock, gases, and ash from deep inside the earth are ejected."


How do intrusiver rocks form?

intrusive rocks are formed within the earths surface from magma. extrusive rocks are formed from lava outside of earths surface


What do you call molten or melted rocks?

Molten rock is also known as lava. Lava is produced by a volcano that is erupting. Lava temperatures range from 1,292 to 2,192 degrees Fahrenheit.


What of rocks form when magma cools below earths surface?

Intrusive igneous rocks


What forms in earths crust when molten material reaches the surface?

When molten material reaches the surface of the Earth, it can solidify into different forms depending on the speed of cooling. If it cools quickly, it forms extrusive igneous rocks like basalt. If it cools slowly underground, it forms intrusive igneous rocks like granite.


How much rocks are on the surface of the earth?

Apart form the Oceans the earths surface is made of rocks.


How and where are igneous rocks formed?

Igneous rocks are formed when molten magma cools and solidifies either beneath the Earth's surface (intrusive) or on the surface (extrusive). Intrusive igneous rocks are formed from magma that cools slowly underground, while extrusive igneous rocks are formed from lava that cools quickly on the surface.


How do fossils provide evidence for moving plates?

Their evidence comes from rocks at earths surface.


How does metamorphic rocks turn into a igneous rocks?

If it finds its way dowm into the earths crust through rock cycle and then is melted and mixes together to form molten magma, it could re-erupt to the earths surface and form an extrusive igneous rock or cool and solidify within the earths crust as an intrusive igneous rock.