UNIT 3 - CONTENTS

1. GEOSPHERE

- Layers of the Earth

- Inge Lehmann

- Minerals

- Rocks

2. ATMOSPHERE

- Layers of the atmosphere

- Importance of the atmosphere

- European Space Agency

- Global warming

- Fighting global warming

3. HYDROSPHERE

- Properties and importance of water

- Ángeles Alvariño González

- Water on Earth

- Water cycle

- Pollution and prevention

-

4. BIOSPHERE

- Why is life possible?

- Lynn Margulis

- Molecules and cells

- Functions of living beings