Because hot air is less heavy cold air is more heavy causing them to shift if cold air is placed on top.
I think it is the Prime Meridian, though I may be wrong.
Answer:
Explanation:
Hammer- inclined plane
door knob- wheel and axle
chisel- inclined plane
screwdriver- inclined plane
hatchet- inclined plane
seesaw- lever
slide- inclined plane
broom- lever
bicycle- wheel and axle
shovel- inclined plane
Hope this helps :)
