V Choose the incorrect statement from the following
- Igneous rocks are called the primary rocks.
- Soil is the product of weathering of rocks.
- Sedimentary rocks are the hardest ones.
- Deccan plateau is the region of Igneous rocks.
- Soil erosion decreases its fertility.
- Dynamic metamorphism is caused by high temperature.
- Soil is a renewable source.
- Humus is a part of the top layer of soil.
VI Consider the following statements and choose the right option from the given ones
1)
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
- 1 and 2 are correct and 2 explains 1
- 1 and 2 are correct but, 2 does not explain 1
- 1 is correct but, 2 is incorrect
- 2 is correct but, 1 is incorrect.
IX Answer briefly
How are igneous rocks formed?
Igneous rocks are formed by the solidification of molten magma. They can form either on the surface as extrusive igneous rocks (e.g., Basalt) or inside the earth’s crust as intrusive igneous rocks (e.g., Granite).
Describe about the composition of soil.
Soil is composed of approximately 45% mineral, 5% organic matter, 25% water, and 25% air. This composition can vary based on location and environmental conditions.
Define ‘rock’.
A rock is an aggregate of one or more minerals or mineraloids. Rocks are the solid mineral material forming part of the surface of the earth and other similar planets.
State the types of soils.
The major types of soils are Alluvial soil, Black soil, Red soil, Laterite soil, Mountain soil, and Desert soil.
What is soil conservation?
Soil conservation is the process of protecting the soil from erosion and other types of degradation to maintain its fertility and productivity. Methods include afforestation, controlled grazing, construction of dams, crop rotation, strip farming, contour ploughing, terrace farming, and checking shifting cultivation.
