Which of the following is a positive feedback mechanism? (select all that apply)
1)global cooling increases glacial size, which decreases sea level, which exposes carbonate rocks to weathering, which releases carbon dioxide into the atmosphere. 2) global warming increases cloud cover, which reflects solar radiation, which decreases global warming.
3)global warming melts sea ice, which decreases reflectivity and increases the amount of absorbed solar radiation.
4)burning coal increases aerosols, which increases reflectivity and decreases global warming.
5) global warming increases cloud cover, which traps heat on earth, which increases global temperatures.

Match the vocabulary word with its meaning

Soweto was the site of one of the that swept across south africa in the late 1970s. in his effort to end apartheid, desmond tutu turned to . the united states responded to south africa’s apartheid policy in the 1980s by .

During metamorphic processes, increased pressure and temperature can affect the of minerals in rock. rocks subjected to very high pressure are typically than others because mineral grains are squeezed together, and the atoms are more closely packed. during metamorphic processes, water facilitates the transfer of ions between and within minerals, which can the rate at which metamorphic reactions take place. the growth of new minerals within a rock during metamorphism has been estimated to be about per million years. metamorphism is commonly associated with convergent plate boundaries, where two plates move toward each other. during contact metamorphism, a large intrusion will contain thermal energy and will cool much more slowly than a small one. metamorphosed sandstone is known as the metamorphic rock made from metamorphosed shale, was once used to make blackboards for classrooms