3. Name the igneous rock formed by quick cooling of lava on the earth's surface.
4. Which rock is formed when gravel, pebbles and stones get cemented together by minerals?
5. On what basis rocks are classified ?
Answers
Answer:
3. The intrusion of large bodies of granite—batholiths—is usually part of the origin of a mountain range. Similarly, a fine-grained, mafic igneous rock is not only a basalt, it is an extrusive igneous rock that formed from rapid cooling and crystallization of a lava flow at earth's surface.
4. This sedimentary rock is formed when pebbles and gravel get cemented together. Dear Student, Conglomerate is a coarse grained rock formed from gravel, stones or pebbles which have solidified. In this rock, stones, gravels or pebbles are cemented together to form a hard mass which can resist weathering.
5. CLASSIFICATION The classification of rocks is based on two criteria, TEXTURE and COMPOSITION. The texture has to do with the sizes and shapes of mineral grains and other constituents in a rock, and how these sizes and shapes relate to each other. Such factors are controlled by the process which formed the rock.