Q1: What are the small grains that make up rocks called?
Ans: Minerals
Q2: What are the three main types of rocks based on their formation?
Ans: Igneous, sedimentary, and metamorphic rocks
Q3: What is the process by which igneous rocks are formed?
Ans: Cooling and hardening of hot molten rock
Q4: What percentage of the Earth's crust is made up of igneous rocks?
Ans: About 95%
Q5: Which type of igneous rock is used for making kitchen counters and floors?
Ans: Granite
Q6: What type of sedimentary rock is used in the construction of the Red Fort in Delhi and Agra Fort in Agra?
Ans: Sandstone
Q7: What is the process that turns lower layers into sedimentary rocks?
Ans: Repeated deposition and pressure
Q8: How are metamorphic rocks formed?
Ans: Due to changes in existing rocks over time, often from high temperature and pressure
Q9: Which non-metallic mineral is used for making blackboards and handheld writing boards?
Ans: Slate
Q10: What are the two main categories of minerals mentioned in the text?
Ans: Metallic and non-metallic minerals
Q11: What are metallic minerals that contain metals such as gold, iron, and copper called?
Ans: Ores
Q12: Which fossil fuel is formed from the remains of dead plants and sea animals buried under the sea?Ans: Petroleum
Q13: What is the primary use of coal?
Ans: As a fuel for cooking, electricity production, and steam engines
Q14: Why is it important to conserve coal and petroleum?
Ans: They are limited resources, and overuse causes pollution and depletion.
Q15: What is a non-polluting and renewable source of energy mentioned in the text?
Ans: Solar energy
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