Question

The rock pictured here has a vesicular texture. It is sometimes called scoria. What type of rock is this and where did it form? A) an igneous rock, deep in the Earth B) a sedimentary rock, in a stream bed C) a metamorphic, rock deep in the Earth D) an igneous rock, at or near the Earth’s surface

Answer 1

C) a metamorphic, rock deep in the Earth

Answer 2

Answer:

Option (D)

Explanation:

Scoria is an igneous rock that is dark in color. When volcanic eruptions take place, the magma comes out to the surface forming lavas and releasing various gases. These lavas due to their reducing temperature start to get solidified. During this process, the air bubbles trapping these dissolved gases get solidified and forms a rock which is commonly known as scoria. They are easily marked by their vesicular structure. They are formed at or near the surface of the earth and they are comprised of basaltic rock types.

Thus, the correct answer is option (D).