Olympiad Test: Soil, Rocks & Minerals - 1 - Class 6 MCQ

Rocks are solid natural substances composed of one or more minerals. For example, granite is made of quartz, feldspar, and mica.

Volcanic soil is a type of soil, not a rock. The three main types of rocks are igneous, sedimentary, and metamorphic.

Igneous rocks form when molten magma or lava cools and hardens. Granite and basalt are examples.

Igneous rocks are called primary rocks because they were the first to form from cooling magma.

Sedimentary rocks form from layers of sediments deposited over time. Examples include sandstone and limestone.

Sedimentary rocks can trap and preserve remains of plants and animals, forming fossils.

Metamorphic rocks like marble and slate are formed when existing rocks undergo changes due to extreme heat and pressure.

Marble is formed from limestone under heat and pressure, making it a metamorphic rock.

Soil forms over thousands of years as rocks break down into smaller particles through weathering caused by wind, water, and temperature changes.

Black soil (also called regur soil) retains moisture and is ideal for cotton cultivation.