The outer core of the Earth is made up of….…
a) nickel-iron alloy
b) platinum
c) copper
d) iron
The temperature at the outer core is about……
a) 2,550°C
b) 4,300°C
c) 3,700°C
d) 3,300°C
Water:
About how many percent of water is frozen in the form of glaciers?
a) 2%
b) 4%
c) 8%
d) 13%
About how many percent is the salted water in the oceans?
a) 32%
b) 57%
c) 93%
d) 97%
Fresh water available to mankind is about………..
a) 1%
b) 3%
c) 7%
d) 11%
