Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

The answers are B. Basalt and D. Granite.

Explanation:

Basalt is an extrusive igneous rock, solid and It is formed by abundant dark minerals such as pyroxene and olivine, which make basalt gray or dark black. It is the most common type of rock in the earth's crust, and covers most of the ocean floor.

Granite is a volcanic plutonic rock formed by the slow cooling of magma to great depths of the earth's crust. This cooling allows large crystals to form, resulting in a crystalline texture, characteristic of granites.

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)