NCERT 5th Class (CBSE) Science: Rocks and Minerals

Question: Continuous heating and cooling breaks even a hard rock into small pieces of sand. What should we learn from this process?

Answer: This process teaches us that no matter how hard we are but with regular practice and hard work and guidance of our elders we can become a fine human being.

Question: How does heat and pressure of earth contribute to the formation of metamorphic rocks?

Answer: Heat and pressure of the earth can change the physical or chemical composition of igneous or sedimentary rocks and leads to the formation of metamorphic rocks.

Question: Can we find fossils in the granite or marble mines? Why?

Answer: We can find fossils in the granite or marble mines because it is formed from sedimentary rocks which can have fossils in them during their formation.

Question: What is the difference between magma and lava.

Answer: The difference between magma and lava is:

1. Magma: Molten rock inside the earth is called magma.
2. Lava: Molten magma that flows out onto the surface of the earth is called lava.

Question: Name the important minerals that are found in igneous rocks.

Answer: The important minerals that are found in igneous rocks are:

1. Mica
2. Feldspar
3. Magnesium