I would carve it into a spear shape, find a stick and some rope and viola! I have a spear to kill an animal and eat it. Or I could just throw the rock really hard...
They would use a rock hammer.
The answer will depend on how big the rock is.
We would use MassSingle!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
they would use a rock to chip away at another rock to make one rock sharp
no
you would use mass
We would use a ruler to measure the length of a rock. Then, when we were ready to write down the result of the measurement, or tell someone else about it, we would pick the best unit of length to use. The best one would be the unit that results in the most convenient number. For a tiny rock, the "millimeter" might be best. For a medium rock, the "centimeter" might be best. For a large rock, the "meter" might be best. A really humongous rock, such as the moon, might warrant the use of the "kilometer".
no
we will use salt
Molten rock is in a volcano
kilograms
no