4th SCIENCE P3P1

Why is Earth called “ The Blue Planet “?.

• Earth is called 'The Blue Planet' because it has the largest landmass.
• Earth is called 'The Blue Planet' due to its high population density.
• Earth is called 'The Blue Planet' because most of its surface is covered in water

• Earth is called 'The Blue Planet' because of its rich vegetation.

What percentage of Earth’s surface is covered in water?

• Three-fourths

• two-fourths

• One-fourths

• Zero-fourths

In What forms can water exist in the hydrosphere?

• Liquid and solid only
• Gas and plasma
• Solid and vapor only
• Liquid, solid (ice), and gas (water vapor)

Where is water found on Earth?

• Water is found in oceans, rivers, lakes, glaciers, groundwater, and the atmosphere.
• Water is found only in the atmosphere.
• Water is exclusively located in deserts.
• Water is only present in the polar regions.

Why do scientists look for water on other planets?

• To determine the age of the planets
• To find new sources of energy
• Because the water is essential for life

• To study the geology of other planets

Into what two groups is Earth’s water classified?

• Freshwater and saltwater
• Ocean water and river water
• Surface water and underground water
• Rainwater and groundwater

What percentage of Earth’s water is salt water?

• 85%
• 50%
• 75%
• 97%

Where is salt water found?

• Rivers and lakes
• Oceans and seas
• Underground aquifers
• Atmosphere

How does groundwater reach the Earth?

• Groundwater is formed from ocean water evaporating into the atmosphere.
• Groundwater reaches the Earth through infiltration from rivers,lakes and rain.

• Groundwater is created by melting glaciers and icebergs.
• Groundwater is produced by underground volcanic activity.

In what form does water exist in the atmosphere?

• Steam and fog
• Hydrogen and oxygen
• Saltwater and freshwater
• Water vapor, liquid droplets, and ice crystals