Scientists sent a _____________ to mars.

The ______ of Earth is 1,800 miles below the surface.

Without _______ people on Earth would float into the air.

Earth's ______ around the sun is not a perfect circle.

Planet and stars are full of ________.

There is a big ________ between the sun and Earth

The ________ of Venus is similar to the _______ of Earth

Many planet's and animals live on our planet's _________.

You can see the moon's _______ with a telescope.

Earth is ______ because it has living creatures.