Class 3 Exam > Class 3 Videos > Hindi for Class 3 (वीणा) > Video: सीखो - सारांश (Animated)
Video: सीखो - सारांश (Animated) Video Lecture | Hindi for Class 3 (वीणा)
FAQs on Video: सीखो - सारांश (Animated) Video Lecture - Hindi for Class 3 (वीणा)
| 1. What are the different types of rocks? |  |
Ans. There are three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks are formed from cooling magma or lava, sedimentary rocks are formed from the accumulation and compression of sediments, and metamorphic rocks are formed through the alteration of existing rocks under high pressure and temperature.
| 2. How are fossils formed? | |
Ans. Fossils are formed when the remains of plants or animals are preserved in sedimentary rock. Over time, the organic material decays and mineral-rich water seeps into the remaining structure, gradually turning it into a fossil.
| 3. What is the rock cycle? | |
Ans. The rock cycle is a continuous process that describes how rocks are formed, weathered, and transformed from one type to another. It includes processes such as erosion, deposition, compaction, melting, and cooling.
| 4. How do geologists determine the age of rocks? | |
Ans. Geologists use a variety of methods to determine the age of rocks, including radiometric dating, which measures the decay of radioactive isotopes within the rock, and relative dating, which examines the position of rocks in relation to one another.
| 5. Why are rocks important to study? | |
Ans. Rocks provide valuable information about Earth's history, processes, and resources. By studying rocks, geologists can learn about past climates, tectonic movements, and the formation of valuable resources such as minerals and fossil fuels.
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