are potassium hydroxide, cesium hydroxide and calcium hydroxide weak bases, strong bases, or acids

What effect does plate tectonics have an organic evolution

When analyzing tree rings, what do scientists assume a thin ring indicates?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point