Planet Earth

What percent of the planet is covered by land?

• 20% of the planet is covered by land.

• 30% of the planet is covered by land.

• 40% of the planet is covered by land.

What percent of the planet is covered by water?

• 50% of the planet is covered by water.

• 60% of the planet is covered by water.

• 70% of the planet is covered by water.

How many continents are there?

• There are seven continents. (Some countries consider them to be only five.)

• There are eight continents. (Some countries consider them to be only five.)

• There are nine continents. (Some countries consider them to be only five.)

What is the highest mountain?

• It is Makalu.

• It is Mount Everest.

• It is Kangchenjunga.

What is the longest river?

• It is the Amazon River.

• It is the Mississippi River.

• It is the Nile River.

What is the largest canyon?

• It is the Grand Canyon.

• It is the Canyon Sainte-Anne.

• It is the Chicamocha Canyon.

Which of the Earth's oceans is the largest?

• It is the Atlantic Ocean.

• It is the Indian Ocean.

• It is the Pacific Ocean.

How much of the Earth's land surface is desert?

• It is about 1/2.

• It is about 1/3.

• It is about 1/4.

How old is Earth?

• It is more than 4.5 to 4.6 billion years old.

• It is more than 5.5 to 5.6 billion years old.

• It is more than 6.5 to 6.6 billion years old.

How long does it take for a plastic bag to decompose?

• It takes 300 years.

• It takes 400 years.

• It takes 500 years.