Earth-and-Earth-Systems1.pptxparts and the uses

Earth

1. 2 major requirements for a planet to become habitable The star should survive long enough for its planets to develop life The planet should exist in a region where water could remain liquid.

2. 2 Truths, 1 Lie about Earth The Earth is the fourth planet from the sun and is the largest of the terrestrial planets. The Earth is the only planet in our solar system not named after a Greek or Roman deity. The Earth was formed approximately 4.5 billion years ago and is the only planet to support life.

3. 2 Truths, 1 Lie about Earth The Earth is the fourth planet from the sun and is the largest of the terrestrial planets. FALSE The Earth is the only planet in our solar system not named after a Greek or Roman deity. TRUE The Earth was formed approximately 4.5 billion years ago and is the only planet to support life. TRUE

4. Earth spheres 4 Subsystems of earth

5. 4 Subsystems of Earth 1. HYDROSPHERE -water portion (71% of Earth’s surface) 2. ATMOSPHERE -thin, life giving gaseous envelope of Earth -air portion (78% nitrogen, 21% oxygen, 0.1% trace gases)

6. Layers of Atmosphere TROPOSPHERE -lowest layer -11km thick -temperature decreases with altitude -weather phenomenon TROPOPAUSE -boundary between the troposphere and the next layer

7. Layers of Atmosphere 2. STRATOSPHERE -11km-48km from Earth’s surface -temperature increase with altitude due to the presence of ozone layer STRATOPAUSE -boundary between the stratosphere and the next layer

8. Layers of Atmosphere

9. LAYERS OF ATMOSPHERE 3. MESOSPHERE -temperature decreases with altitude - -90 degrees , coldest temperature in the atmosphere MESOPAUSE - separates the mesosphere and the layer above it 4. THERMOSPHERE -about 55km -receive the most high energy radiation -Aurora

10. Auroras happened in Thermosphere

11. 4 SUBSYSTEMS OF EARTH 3. GEOSPHERE -solid region of Earth -divided into different layers: a. crust b. mantle c. inner core d. outer core

12. LAYERS OF EARTH a. CRUST -outermost layer ASTHENOSPHERE: 700km thick; weaker semisolid or plastic asthenosphere b. MANTLE -lies beneath the crust divided into two layers: Upper mantle & lower mantle UPPER MANTLE: 100 km thick; made of solid rocks LOWER MANTLE: 2,100 km; made of hot semisolid rocks

13. Layers of Earth

14. LAYERS OF EARTH c. CORE -center of Earth INNER CORE -radius of 1216 km; mostly solid iron OUTER CORE - 2,260 km thick; responsible for Earth’s magnetic field ; liquid iron and nickel

15. 4 Subsystems of Earth 4. BIOSPHERE -biological component of Earth -microbes, plants, animals