How does frost break up rocks?
Frost can shatter rocks, making it one of the most important causes of erosion in cold regions. Water seeps into small cracks in rocks and freezes at night, when frost appears. As water freezes it expands slightly, opening up cracks in the rock until parts of it flake away. This process continues until large masses of rock are broken up. It is the cause of the piles of shattered rock, or scree that are commonly found at the foot of mountains. You can see the same process at work when a clay flowerpot left in the garden in winter begins to flake and crack.
Picture credit: google
Why do icebergs float?
Ice floats because it is lighter than water. Most objects shrink when they get cold, but when water freezes it expands slightly. In this way ice becomes lighter than water. It is only slightly lighter however, and so nine-tenths of a floating iceberg lies under the water.
Picture credit: google