On mohs scale, ice has a hardness of 1.5. why can a glacier cause the grooves and parallel scratches (striations) found in bedrock of granite and gneiss? answer

The glacier carries along with ice, rocks that create the grooves and scratches. As a simple example, paper is relatively soft, yet sandpaper is quite capable of sanding substances with a mohs scale hardness of 9 or lower. Reason is quite simple. The sandpaper has embedded on its surface, silicon carbide which has a hardness of 9 to 9.5. And glaciers can carry boulders and rocks along their bottom surface which in turn can grind and scrape softer materials.

The earth spins around. one side faces the sun, one side faces space. the side facing the sun, we call daytime. side facing away is cooler and is nighttime. a day on earth is 24 hours, that’s how long it takes the earth to fully rotate one time. hope this !

This is a true statement  hope this : )