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Fill in the blanks with correct words. Choices are displayed on the right.

The Rocky Planets

Mercury is the smallest planet in our _________ atmosphere

system and _________ to the sun. It is only

slightly larger than Earth's _________. It is the greenhouse

fastest planet, zipping around the sun every 88 warmer

Earth days.

solar

Venus _________ slowly in the opposite dusty

direction from most planets. A thick atmosphere

traps heat in a runaway ____________ effect, moon

making it the _________ planet in our solar wetter

system.

spins

Mars is a _________, cold, desert world with a

very thin ____________. There is strong closest

evidence Mars was _________ and _________ hottest

with a thicker atmosphere billion years ago.