Answer:
B.) Mesozoic!
Explanation:
Molten rock underground is commonly known as magma. Magma is a hot, semi-fluid or fluid rock material that exists beneath the Earth's surface.
It is formed through the partial melting of rocks in the Earth's mantle due to high temperature and pressure. Magma can vary in composition, depending on the type of rocks that melt and the degree of melting.
When magma reaches the Earth's surface through volcanic eruptions, it is then referred to as lava. Lava can flow out of volcanoes, and as it cools and solidifies, it forms various volcanic landforms such as lava flows, volcanic domes, and volcanic islands.
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Complete question
Molten rock under ground is called _____
B. fossil
C. event
D. stratum
a population decrease in Russia
The answer would be: The rock cooled quickly.
These types of igneous rocks are called extrusive rocks. These are igneous rocks that cooled on the surface. They form only small crystals because they cool quickly at the surface. Intrusive rocks are its counterpart, they form bigger crystals because they form underground and slowly allowing time for bigger crystals to form.