Chapter 25, Problem 13RQ

To determine

The place on Earth’s surface where lava flows are most common.

Answer to Problem 13RQ

Lava flows are most common through cracks, fissures and a central vent in Earth’s surface.

Explanation of Solution

The melting of pre-existing rocks under Earth’s surface forms magma. These melted rock forms contain several minerals in it. Silica is one of the major minerals that form the highest constitution of the rocks. Based on the silica content in the melted rocks, the quality and the types of magma are classified. It originates in the lower part of the Earth’s crust and in the upper portion of the mantle. This magma, when moves up to the Earth’s surface then it is known as lava. Lava erupts through cracks, fissures, or a central vent in Earth’s surface.

Conclusion:

Therefore, the lava flows are most common through cracks, fissures and a central vent in Earth’s surface.