Look out for falling rocks.
The area along the road is unstable and rocks could fall loose onto the roadway.
The sign is warning that you should be vigilant for objects in the road.
Gravity
True.
plummet
avalanch
A falling rock in vacuum accelerates at 9.8 meters per second2 ... the acceleration of gravity at the earth's surface.A falling rock in air has a smaller acceleration than in vacuum, because of air resistance;the exact figure depends on the rock's weight and shape.A falling rock in water has an even smaller acceleration than it air, because of water resistance; the exact figure again depends on the rock's weight and shape.
leaves falling
it is gravity
It means that a small piece of rock entered Earth's atmosphere and was vaporized by the heat of entry.
2:1
Gravity
True.
It is a meteorite.
diabase rock stops you from falling into the center of the earth!
Falling, roughly falling.
falling iinto a rock
its a piece of rock falling from a volcano
splash