b) a real or imaginary straight line going through the center of a object that is spinning, or a line that divides a symmetrical shape into two equal halves
Axis
15
c) a mixture of gases that surrounds any planet
Atmosphere
15
d) to make someone more likely to do something, or to make something more likely to happen
Encourage
15
e) to cause a liquid to change to a gas, especially by heating
Evaporate
15
f) the group of people who officially control a country
Government
15
the lightest gas, has no color, taste, or smell, and combines with oxygen to form water
Hydrogen
15
an extremely large, round mass of rock and metal, such as Earth, or of gas, such as Jupiter, that moves in a circular path around the sun or another star
planet
15
i) a situation in which a difficult choice has to be made between two different things you could do
Dilemmas
15
without limits; extremely large or great
Infinite
15
to fall or shrink together abruptly and completely
collapse
15
the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
gravity
15
strange and not familiar
alien
15
relating to the whole world; worldwide.
global
15
a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity