LESSON 1 uniqueness of the earth.pptx

earth & life Science

1. LESSON 1: UNIQUENESS OF THE EARTH recognize the uniqueness of the earth being the only planet in the solar system with properties necessary to support life (S11/12ES-la-e-3)

2. What’s make the Earth unique?

3. C haracteristics of the Earth

4. Earth’s Location Earth is the third planet in the solar system. is considered to be one of the inner planets next to Venus. Its distance from the sun is about 93 million miles and it takes about 500 seconds for sunlight to reach the earth’s surface. This distance from the sun is enough to support life.

5. Earth’s Atmosphere The atmosphere is the gaseous layer that envelops the earth. It regulates the planet’s surface temperature. However, due to its cooling mechanisms, it protects the living things to be directly affected with harmful radiation. O 3 → O 2 + O Photodissociation is the process by which ozone molecules (O3) in the stratosphere is broken down (decomposition reaction) into elemental oxygen (O) and diatomic oxygen (O2) as it absorbs high energy solar radiation and then convert it into low energy radiation. This way, harmful high-energy radiation will not go directly into the earth’s surface.

6. Earth’s Size and Mass The size of the earth also plays a vital role in keeping its life support system afloat. The size of a planet is directly related to its gravitational pull. The acceleration due to gravity helps the planet maintain its atmosphere . Earth interacts gravitationally with the sun. Its gravity as a result of its mass, also keeps the moon along its orbit. The moon, as the only natural satellite of Earth, plays a vital role in the existence of all life forms.

7. Earth’s Magnetic Field Its geographic north serves as its magnetic south and its geographic south serves as its magnetic north. The inner core is the solid layer of the earth and is made predominantly of iron.

8. Presence of Water Life as we know it, is impossible without a biologically essential compound called water ( H 2 O ). water exists as gas forming clouds, as liquid in the form of oceans and lakes and as solid in the form ice caps. Water has a cooling effect due to its heat capacity. It has the capacity to absorb heat without raising its own temperature. As a result, life on earth will be benefited by the cooling effect of water.

9. Essay What is the significance of understanding the characteristics of the earth? 2. Which of the aforementioned unique characteristic of earth do you like the most and why?

10. Rubrics 1 : for Essay/ Writing Activity Content & Development ( 70 %) Organization & Structure (15 %) Grammar, Punctuation & Spelling ( 15 %)