The heavy long bone that forms the leg above the knee is called the

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.