Since 1970, April 22 has marked Earth Day around the world and is celebrated to raise awareness about protecting the environment. Put your knowledge about the Earth to the test with this short quiz all about our planet.

Earth's circumference
NASA

What is the Earth's circumference?

A. 21,356 miles
B. 24,901 miles
C. 26,874 miles
D. 29,792 miles

Earth's circumference
NASA

B. 24,901 miles

Circling the Earth in trash
Shutterstock

In 2009, Americans produced enough trash to circle the Earth how many times?

A. 21
B. 24
C. 29
D. 33

Circling the Earth in trash
Shutterstock

B. 24

Largest earthquake
Shutterstock

The largest earthquake to shake the Earth was 9.5 in magnitude. Where did it hit?

A. China
B. United States
C. India
D. Chile

Largest earthquake
Shutterstock

D. Chile

It occurred on May 22, 1960.

Hottest spot
Shutterstock

The hottest spot on Earth is El Azizia, Libya. How hot was it there on the hottest day — Sept. 13, 1922?

A. 131 degrees Fahrenheit
B. 137 degrees Fahrenheit
C. 142 degrees Fahrenheit
D. 145 degrees Fahrenheit

Hottest spot
Shutterstock

B. 137 degrees Fahrenheit

Coldest spot
Associated Press

The coldest temperature ever recorded on Earth was -128.6 degrees Fahrenheit.

Where was it recorded?

A. Russia
B. Northern Canada
C. Antarctica
D. Greenland

Coldest spot
Associated Press

C. Antarctica

Aluminum can
Jeffrey Allred, Deseret News

Aluminum cans can be recycled and back on shelves in as little as how many days?

A. 60
B. 70
C. 80
D. 90

Aluminum can
Shutterstock

A. 60

Tallest mountain
Associated Press

Which mountain has the highest summit above sea level?

A. Mount Everest
B. K2
C. Kangchenjuna
D. Lhotse

Tallest mountain
Associated Press

A. Mount Everest; summit is 29,029 ft. above sea level.

K2 is 28,251 ft. above sea level.

Kangchenjunga is 28,169 ft. above sea level.

Lhotse is 27,940 ft. above sea level.

Most species
Associated Press

Where would you find the most species (plant and animal) per unit area?

A. Rainforests
B. Coral reefs
C. Deserts
D. Marshlands

Most species
Associated Press

B. Coral reefs

Plastic bottles
Shutterstock

Approximately how many plastic bottles do Americans throw away every hour?

A. 500,000
B. 1 million
C. 1.5 million
D. 2.5 million

Plastic bottles
Shutterstock

D. 2.5 million

Lowest point on land
MCT

The lowest point on land is 1,388 ft. below sea level. Where is it located?

A. Death Valley
B. Lake Assal*
C. Caspian Sea*
D. Dead Sea*

*Elevation measured at the shoreline

Lowest point on land
Associated Press

D. Dead Sea. Its surface and shores are 1,388 ft. below sea level.

Lake Assal is 509 ft. below sea level.

Death Valley is 282 ft. below sea level.

Caspian Sea is 92 ft. below sea level.

Not so green
Shutterstock

According to one microbial geneticist, anciently, the Earth may have been this color instead of green.

A. Purple
B. Pink
C. Brown
D. Yellow

Not so green
Shutterstock

A. Purple

Microbial geneticist Shil DasSarma of the University of Maryland claims that ancient microbes might have used a molecule other than chlorophyll (the green pigment found in plants) that gave off a violet hue.

Speed around the sun
Jeffrey Allred, Deseret News

How fast is Earth moving around the sun?

A. 67,000 miles per hour
B. 71,000 miles per hour
C. 74,000 miles per hour
D. 77,000 miles per hour

Speed around the sun
Jeffrey Allred, Deseret News

A. 67,000 miles per hour