This chapter explains that Earth is our shared home and the only known planet that supports life because it has air, water, and a suitable temperature. The lithosphere (land) gives us soil, minerals, forests, and shelter; the hydrosphere (water) covers about 71% of Earth’s surface and is essential for life and transport; and the atmosphere (air) provides oxygen, carbon dioxide, and protection from the Sun’s harmful rays. Together, these form the biosphere, where all living things exist in interdependence—plants, animals, and humans rely on each other for food, air, and balance. However, human actions like pollution, deforestation, and overuse of resources are harming Earth. To protect our planet, we must follow the 3Rs—Reduce, Reuse, and Recycle, and live responsibly to keep Earth healthy for future generations.
Key Points
Earth is the only known planet with life due to air, water, and suitable temperature.
Land, water, and air are the three main components that support life.
Land (Lithosphere): Provides soil for plants, minerals, forests, and places to live.
Water (Hydrosphere): Covers 71% of Earth’s surface; essential for drinking, farming, transport, and aquatic life.
Air (Atmosphere): Provides oxygen for breathing, carbon dioxide for plants, and protects Earth from harmful Sun rays.
Diversity of life: Earth is home to millions of plants, animals, and humans.
Interdependence: Plants, animals, and humans depend on each other for food, oxygen, and balance of nature.
Environmental issues: Pollution, deforestation, overuse of resources, and climate change threaten Earth.
Conservation is necessary: Reduce, Reuse, Recycle (3Rs) help protect Earth.
👉 👉 Earth is our shared home. We must take care of it, protect its resources, and live responsibly to ensure a safe future for all living beings.