Which describes the elements in any given period of the periodic table? a. they have common chemical properties, such as reactivity. b. they are in the same family. c. their properties change according to a pattern as you go from left to right l. d. their properties change according to a pattern as you go from top to bottom.

c, They go from left to right on the periodic table.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.