Landscape in which limestone is eroded to from deep valleys and caverns.

The answer for #3 is c but i don't know why

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here