1. Mars is the .............. planet from the sun.

fifth

fourth

first

second

2. Mars surface is made up of ............... .

water

iron

mud

sand

3. Mars is only about ............... of the size of Earth.

full

third

half

quarter

4. the polar ice caps contain a mixture of frozen water and .............. .

Ca

Na

H2o

CO2

5. There has been historical evidence found that astronomers had been drawing maps of Mars since .............. .

1875s

1895s

1860s

1953s

6. In 1877, astronomer Giovanni Schiaparelli discovered .............. on Mars.

sand

creatures

water canals

moon