1 |
the metal that is usually extracted from sea water is
|
Ca <br>
Na
K
Mg <br>
|
2 |
The method of concentrating the ore which makes use of the different in density between ore and impurities is called?
|
Liquidation<br>
Leaching<br>
Levingation <br>
magnetic separation<br>
|
3 |
The axis tilt of mercury is how many degrees? |
58
2
12
90
|
4 |
The largest asteroid in the asteroid belt |
vesta
ceres
charon
deimos
|
5 |
This planet has an atmosphere with a mass 100 times greater than earth's and is a perfect example of the green house effect? |
jupiter
saturn
mars
venus
|
6 |
On this planet's surface rests the largest volcano in the solar system? |
mercury
venus
jupiter
mars
|
7 |
Which planet is known as Earth's near twin planet? |
mercury
mars
venus
neptune
|
8 |
What is the predominant gas in venus's atmosphere? |
sulphur dioxide
nitrogen
carbon dioxide
hydrogen
|
9 |
The rising of the evening star indicates the |
south pole
north pole
east
west
|
10 |
The planet which has longest year is |
mercury
venus
earth
neptune
|