Our Planet- The Earth
ICSE · Class 3 · Social Science
Flashcards for Our Planet- The Earth — ICSE Class 3 Social Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Why is Earth called the 'Blue Planet'?
Answer
Earth is called the 'Blue Planet' because about three-fourths of its surface is covered with water. From space, it looks blue because of the oceans.
What are the three essentials of life on Earth?
Answer
The three essentials of life on Earth are air, water, and sunlight. These help all living things like humans, animals, and plants to survive.
What is the atmosphere?
Answer
The atmosphere is a layer of air that surrounds the Earth. It is made up of gases like oxygen, nitrogen, and carbon dioxide, which are important for life.
Why do we need oxygen?
Answer
We need oxygen to breathe. Both humans and animals use oxygen from the air to stay alive.
How does carbon dioxide help plants?
Answer
Plants use carbon dioxide from the air to make their food in a process called photosynthesis. This happens in the presence of sunlight.
In how many forms does water exist on Earth?
Answer
Water exists in three forms on Earth: liquid (like in rivers), solid (like ice), and gas (like water vapour in the air).
What happens if there is no water on Earth?
Answer
Without water, no living thing can survive. We cannot live for more than a few days without water. Plants and animals also need water to live.
Why is sunlight important for life?
Answer
Sunlight gives us light and heat. It helps keep the Earth warm, helps plants grow, and gives energy to all living things.
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