Question

Hot molten rock material inside the earth is called __________ and after reacting to the earth’s surface, it is known as ________.
A. Magma, lava
B. Lava, Magma
C. Crater, Magma
D. Lava, crater

Answer 1

Hint: The hot molten or the semi-molten natural material is present beneath the surface of the planet and when the hot molten rock material reacts to the surface it forms igneous rocks.

Complete answer: A vent or opening in the earth’s crust through which molten material erupts suddenly is known as Volcano. In other words, it can be said that it is a place where the ashes, gases, and molten rock material or lava escape to the ground is known as Volcano.

The molten or the semi-molten natural material from which all igneous rocks are formed is known as Magma. Beneath the surface of the earth, the Magma is found. With the melting of the magma at various tectonic settings, magma is produced.

The molten rock or magma that comes out from the interior of a terrestrial planet or moon is known as Lava. The term lava is an Italian word, which is derived from labes, a Latin word, which means slide or fall. The internal heat of the moon or planet generates the magma and erupts as lava through the fractures in the crust or volcanoes.

While talking about the remaining term,
An approximately circular depression in the ground caused by volcanic activity is known as a volcanic crater. A volcanic crater is generally a bowl-shaped feature in which vents occur.

Thus the correct option is A.

Note: On the basis of the nature of eruption and the form developed at the surface, volcanoes are classified. Shield volcanoes, cinder cone volcanoes, composite volcanoes, the mid-ocean ridge volcanoes are four major types of volcanoes.