Renewable Energy

The longest one syllable word is “screeched.”

What are renewable resources? They are resources that can

be replaced at a rate about as fast as they are used up.

Examples: oxygen, plants, soil and solar energy

Air - renewable resource (78% Nitrogen and

21% Oxygen)

Air Pollution: It occurs when some part of the environment is changed in a way that makes it

unfit for humans, animals, and or plants.

Natural sources of air pollution: forest fires, dust from soil, and volcanic eruptions.

Photosynthesis: process where plants

use light from the sun to convert carbon dioxide and water to sugars and oxygen.

Land and Soil

29% of earth’s surface is land but less than 25% of earth’s land can

be used to grow crops.

Soil Fertility: The ability of soil to grow plants.

There are 2 Problems that limit soil renewability:

1. Soil erosion: Breakdown of soil by wind and flowing water.

2. Soil depletion: when the soil loses its nutrients due to harvesting.

Water:Over 70% of earth’s surface is covered by water

97% of this water is found in the oceans which is too salty to drink or use for crops

The supply of fresh water is constantly being recycled (Water Cycle) – a

renewable resource.

There are two problems with water:

1. Quantity: amount of Rainfall is different all over the world.

2. Quality: Easily polluted

The main industry here in California is Agriculture even though the average

rainfall for California is 21.44 in. Therefore, most of the water So. California uses comes from No.

California and the Sierra Nevada Mts. through the California Aqueduct. It

provides water supplies for 25 million Californians and 750,000 acres of

irrigated farmland.

Water Pollution

Sources of water pollution – industrial and domestic waste.

A man is on the train track and a train is coming his way but

instead of getting off of the tracks right

away he runs towards it, and then gets off

the track. Why?