Why do sunspots appear dark in pictures of the sun? a. they are holes in the solar surface through which we can see to deeper, darker layers of the sun. b. they are too cold to emit any visible light. c. they emit light in other wavelengths that we cannot see. d. they are tiny black holes, absorbing?

Match the vocabulary word with its meaning

Which area on the map would be most likely to have the most oil exploration in since the start of the 21st century? a) b) c) d) plz me

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