Weathering is defined as the process by which rock materials are broken down by the action of physical or chemical processes. Physical weathering is known as mechanical weathering, where rocks breakdown into smaller pieces by mechanical means.
Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Once a rock has been broken down, a process called erosion transports the bits of rock and mineral away
Mechanical weathering (also called physical weathering) breaks rock into smaller pieces.
EXPLANATION:
Erosion happens when rocks and sediments are picked up and moved to another place by ice, water, wind or gravity. ... When the water freezes it expands and the cracks are opened a little wider. Over time pieces of rock can split off a rock face and big boulders are broken into smaller rocks and gravel.
eventually there wouldn't be enough for the bottom of the chain then they would die and then the middle of the chain would eventually die and then the top will die
