Directions: Add 13 missing apostrophes in the sentences below.
1. Deserts are our planets driest places—they get almost no rain. Sometimes theyre so sizzling hot that raindrops dry up before hitting the ground.
2. Deserts arent always hot and sandy! Icy-cold Antarctica is actually the worlds biggest desert. Some say it hasnt rained in parts of the continent for more than two million years!
3. Hills of sand, called sand dunes, can grow to be 4,000 feet tall. Thats taller than two Empire State Buildings stacked on top of each other.