Which of the following is an extrusive igneous rock that contains so many air pockets that it often floats in water a.) obsidian b.) granite c.) gabbro d.) pumice

explanation:

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.