Why would the crystals in an intrusive igneous rock be larger than the crystals in a chemical sedimentary rock? a. intrusive rocks form beneath the earth's surface, so they cool very slowly, which produces larger crystals. b. chemical sedimentary rocks form from dissolved substances on the earth's surface with very high heat and cool very slowly, which produces smaller crystals. c. chemical sedimentary rocks and intrusive rocks have crystals of the same size. o d. chemical sedimentary rocks form deep in the earth, so they cool slower, which produces small crystals. € read question correct:
Intrusive rock also called plutonic rock. They are formed from magma forced into older rocks at depths within the earths crust.
(b) Decompression melting , flux melting
Decompression melting : The procedure of decompression melting includes the upward development of the earth mantle to a zone of lower pressure. The decrease in overlying weight empowers the stone to melt, prompting magma arrangement. Magma is shaped by the melting of the earth mantle.
Flux melting :I n molten petrology and volcano logy, flux melting happens when water and other unstable segments are added to hot strong shake. In designing and metallurgy, transition is a substance, for example, salt, that creates a low dissolving point blend with a metal oxide.
Similarly, the expansion of water and other unstable mixes to rocks made out of silicate minerals brings down the softening temperature of those stones.
Intrusive rock formed from cooled magma
Intrusive rock, also called plutonic rock, igneous rock formed from magma forced into older rocks at depths within the Earth's crust, which then slowly solidifies below the Earth's surface, though it may later be exposed by erosion.
Magma cools slowly inside a volcano. (B)
The correct answer is option b. Decompression melting; flux melting.
The Decompression melting process takes place in mid-ocean ridges.
What happens here is that two plates are separated, and the space between them is filled with hot rock that emerges from below. If this rock rises quickly before it can cool, it melts as the pressure drops as the rock approaches the surface.
Flux melting occurs when a solid rock is hot and receives water or other volatile components. This process is found in the subduction zones, where the rock of the upper mantle is melted by the addition of these materials that come from the descending plate.
A way to remember which forms were is that intrusive has the word in.
and extrusive has ex or exit.
The intrusive rocks are forming deep bellow the surface, and they cool off very slowly. Because of that they are forming big crystals.
The extrusive rocks are forming on the surface, and they cool off very quickly. Because of that they are forming small crystals.