Earth's Systems and Conservation

Front

What is the atmosphere?

Back

The layer of air around Earth that provides oxygen and protects from the Sun’s harmful rays.

Front

What does the hydrosphere include?

Back

All the water on Earth, including oceans, lakes, rivers, and ice.

Front

What is the geosphere?

Back

The solid part of Earth, including mountains, rocks, soil, and land.

Front

What does the biosphere include?

Back

All living things, such as plants, animals, and people.

Front

What is the water cycle?

Back

The process of water moving around Earth, changing forms through evaporation, condensation, and precipitation.

Front

What happens during evaporation in the water cycle?

Back

The Sun heats water, turning it into vapor that rises into the air.

Front

What happens during condensation in the water cycle?

Back

Water vapor cools and turns into droplets, forming clouds.

Front

What happens during precipitation in the water cycle?

Back

Water falls back to Earth as rain, snow, sleet, or hail.

Front

Why can't humans easily use saline water?

Back

Saline water contains salt, which dehydrates humans and is not suitable for drinking or crops.

Front

What is freshwater and why is it scarce?

Back

Freshwater contains low salt levels and is scarce, with most found in glaciers, ice caps, and groundwater.