Which of these rocks are formed by great pressure? select the two correct answers.

a. basalt
b. sandstone
c. marble
d. schist
e. limestone

The two correct answers are Marble and Schist.

Metamorphic rocks are the rocks which are formed due to high pressure and temperature. They are found buried inside the earth where the temperature is very high. The temperature inside is very high and the so the buried also has very temperature and pressure.

Schist: This is very weak and even a very small amount of pressure can break it. Due to its weak physical qualities this rock is not used for commercial purpose like making building and sculptures.

Marble: Marbles are used because of its beauty. This rock does not breaks easily and can be used for making buildings and sculptures.

a

explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.