ദ്ദി ≽^⎚˕⎚^≼ .ᐟ lesson 9: earth's water resources

water cycle

1. evaporation

2. condensation

3. precipitation

4. runoff

Evaporation

• water changes from a liquid to a gas or vapor.

• occurs when the sun heats up the surface of bodies of water, such as oceans, lakes, and rivers.

• Water can also evaporate from plants through a process called transpiration.

Condensation

• water vapor in the air cools and changes back into a liquid.

• forms clouds in the atmosphere, which are made up of tiny water droplets.

Precipitation

• This is when water falls from the atmosphere to the surface of the Earth in the form of rain, snow, sleet, or hail.

• This occurs when the clouds become too heavy with water droplets and gravity pulls them down to the ground.

Runoff

• this is the movement of water across the land surface, either as sheet flow, channels or underground streams.

• The _____ either seeps into the ground, eventually returning to the ocean or flows into rivers and streams, eventually returning to the ocean.

TYPES OF WATER RESOURCES:

1. freshwater

2. saltwater

freshwater

• contains low concentration of dissolved salts and is typically found in lakes, rivers, groundwater, and ice caps.

• vital resource for human and animal consumption, agriculture, and various industrial uses.

saltwater

• contains high concentration of dissolved salts, such as sodium and chloride, and is typically found in oceans, seas, saltwater, and lakes.

• covers approximately 97% of the earth’s water resources and is an important ecosystem for marine life.

SURFACE WATER

• This is water that is found in lakes, rivers, streams, and other bodies of water on the Earth's surface.

• _____ is often used for drinking water, irrigation, and recreation.

GROUND WATER

• This is water that is found underground in the spaces between soil particles and rocks.

• _____ is accessed through wells or springs and is often used for drinking water, irrigation, and industrial purposes.

ATMOSPHERIC WATER

• This is water that is found in the atmosphere in the form of water vapor.

• _____ is important for the water cycle because it contributes to the formation of clouds and precipitation.

WATER SCARCITY

• It is a pressing global issue that occurs when the demand for water exceeds the available supply.

• This can be caused by a variety of factors, including population growth, climate change, overuse of water resources, and pollution.

SUSTAINABLE WATER MANAGEMENT

• practice of managing water resources in a way that meets the needs of current and future generations while ensuring the long-term health of the ecosystem.

• It involves balancing competing demands for water, such as agriculture, industry, and human consumption.