100+ Rocks and Minerals Questions and Answers Pdf - 2

Question: 6

What are dykes?

Dykes are thin vertical veins of Igneous rock that form in the fractures found within the crust.

Question: 7

How are sedimentary rocks formed?

The soft ad loose sediments settle as layer upon layer. The overlying weight squeezes the materials close together ad cements them together. The solid mass is then a sedimentary rock.

Question: 8

Describe a volcanic pipe?

Sill is horizontal planes of solidified magma that run parallel to the grain of the original rock deposit. Batholic is a large plutonic masses of intrusive rock, with more than 100 square kilometers of surface area. If a dyke reaches the surface of the Earth, it is then called a volcanic pipe. This feature is extrusive in nature.

Question: 9

Write a short note on Extrusive rocks?

Extrusive igneous rocks are formed by magma that reaches the earth’s surface along deep cracks and volcanic vents. This magma forms broad flat sheets or it builds up a volcanic mountain by repeatedly erupting from a vent. Most types of lavas cool rapidly resulting in the formation of extrusive rocks.

Question: 10

Name the agents that break the rocks everyday?

Wind, temperature changes, water and ice are the agents that break the rocks everyday.