What might cause a theory to change 

Billy is testing golf balls. He drops three different brands of balls from 40 cm and measures how high they bounce. He drops each ball 10 times. This is an example of ________

An infrared telescope can be used to see the farthest regions on the solar system.  Which of the following fields of study would an infrared telescope be used in?

The idea that the Earth's continents have moved over geologic time relative to each other is widely accepted because of lots of evidence. This idea explains why certain fossils are found in specific regions.  This idea is an example of a(n) 

I student wanted to investigate if lemon trees receiving the most water produced the most lemons.  What was the independent (test) variable  in the experiment?

Glaciers are huge slow moving mountains of ice that can change the way the land looks. When glaciers get moving they are like bulldozers that erode the land, tearing up trees and carrying rocks and soils away.  When a glacier is moving, which spheres of the earth are interacting?