WILL MARK BRAINLEST 30 POINTS
Glaciers are one of the most powerful agents of weathering and erosion. ______ causes glaciers to move to the _____ elevation in their paths as they slowly flow over landscapes. Over millions of years, glaciers have ______  entire continents. 
First blank choices: Gravity or friction
Second blank choices: Lowest or Highest 
Third blank choices: Formed or Reshaped