If you want to know more about the people and places on Earth's surface, you should study __________________.

It is important to study _____________ so we know how to prepare for earthquakes and to know what's in Earth's crust.

________________ caves are not well traveled because they could be dangerous if they are too far below the surface.

Great Britain claimed ______________ in North America and sent colonists to live there.

You must be really brave to be a(n) _____________________ because there is a lot of training involved to go to space safely.

Before we had airplanes and commercial jets, explores had to ___________________ to find new land around the earth.

Whenever I eat too much popcorn at the movies I begin to feel _____________ because the butter makes my stomach feel gross.

Museums often contain ____________ treasures that were found in the sea.

It is very hard to ____________ an airplane or ship because the winds may be too strong.