Show:
Earth
Water
Forest
Air
Earth Day
100
The fastest land animal.
What is a cheetah?
100
The largest ocean on our planet.
What is the Pacific Ocean?
100
The world's most common tree.
What is a pine tree?
100
They absorb and store carbon dioxide and release oxygen.
What are trees?
100
The 3 R's.
What are Reduce, Reuse and Recycle?
200
The longest mountain range on Earth.
What are the Andes?
200
The percentage of Earth's surface covered in water.
What is 70%?
200

Trees that lose leaves in autumn.

What are deciduous trees?

200
The most common greenhouse gas.
What is carbon dioxide?
200

The date of Earth Day.

What is April 22nd?


300
The largest island.
What is Greenland?
300
Amount of water (percentage) available for drinking water.
What is 1%?
300
The age of the oldest tree.
What is 6000 years old?
300
The main gas found in air.
What is nitrogen?
300

Types of "clean energy".

What is renewable energy (solar, wind, geothermal, biomass, hydropower)?

400
The age of the Earth.
What is 4.5 billion years old?
400
The 2 biggest water pollutants.
What are pesticides and fertilizers?
400

The average number of trees cut down each day in the world.

What is 10 million?

400
This layer found in the atmosphere protects the earth from harmful ultraviolet light.
What is the ozone layer?
400

The thing that pollutes the most.

What are the burning of fossil fuels?

500

The circumference of the earth.

What is 40,000 km (25,000 miles)?

500
The deepest part of the ocean.
What is the 11 km deep (Marianas Trench).
500
The amount of oxygen released by trees per year.
What is 120 pounds of oxygen?
500
The percentage of oxygen in the air.
What is 21%?
500

The year Earth Day began.

When is 1970?