Which characteristics describe this rock sample? Check all that apply. Which characteristics describe this rock sample? Check all that apply.

evidence of rapid cooling
evidence of slow cooling
small crystals
large crystals
smooth texture
coarse texture

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.