Answer the questions about our planet.

Choose the correct option.

What is the name of the planet we live on? [Earth|Moon|Terra]

How old is our planet? [About four point five billion years old|About forty-six thousand years old|About fourteen point four million years old]

How much of its surface is covered by water? [About fifty percent|About ninety percent|About seventy percent]

How many people live on our planet? [More than seven billion|About five point eight million|About eighty billion]