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Our Earth Video Lecture | Social Science for Class 2

21 videos|75 docs|30 tests

FAQs on Our Earth Video Lecture - Social Science for Class 2

1. What are some examples of renewable resources?
Ans. Renewable resources are natural resources that can be replenished or regenerated within a reasonable amount of time. Some examples of renewable resources include solar energy, wind energy, hydropower, biomass, and geothermal energy.
2. How does deforestation contribute to climate change?
Ans. Deforestation refers to the clearing of forests on a large scale, primarily for agriculture, logging, or urbanization. When trees are cut down, they release the carbon they have stored as carbon dioxide (CO2) into the atmosphere, contributing to the greenhouse effect and climate change.
3. What is the greenhouse effect?
Ans. The greenhouse effect is a natural process that occurs when certain gases in the Earth's atmosphere trap heat from the sun and prevent it from escaping back into space. These gases, including carbon dioxide (CO2) and methane (CH4), act like a blanket, keeping the Earth warm and habitable. However, human activities have increased the concentration of these gases, leading to an enhanced greenhouse effect and global warming.
4. How does recycling help protect the environment?
Ans. Recycling is the process of converting waste materials into reusable materials. By recycling, we can reduce the need for extracting and processing raw materials, which often leads to environmental degradation. Recycling helps conserve natural resources, save energy, reduce air and water pollution, and decrease the amount of waste being sent to landfills.
5. What are the impacts of air pollution on human health?
Ans. Air pollution can have severe impacts on human health. Breathing in polluted air can cause or worsen respiratory problems such as asthma, bronchitis, and allergies. Long-term exposure to air pollution has been linked to cardiovascular diseases, lung cancer, and premature death. Additionally, air pollution can impair lung development in children and contribute to neurological disorders and cognitive decline in adults.
21 videos|75 docs|30 tests

Timeline

00:00 Introduction
00:34 Objectives
00:56 Our Earth
01:43 Air
02:07 Water
02:35 Waterfall
02:52 Lakes
03:01 Self Assessment
03:19 Land
03:34 Hills and Mountains
03:48 Plains and Valleys
04:08 Self Assessment
04:15 Save the Earth
04:51 Summary
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