Question

8. __________________ occurs at ocean ridges, whereas __________________ occurs at subduction zones.

a. Flux melting; decompression melting

b. Decompression melting; flux melting

c. Formation of intrusive rocks; formation of extrusive rocks

d. Formation of extrusive rocks; formation of intrusive rocks

Answer 1

The correct answer is option b. Decompression melting; flux melting.

Step-by-step explanation:

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.

Answer 2

(b) Decompression melting , flux melting

Step-by-step explanation:

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.