The amount of matter that cycles through a food web
a) stays constant.
b) continually increases.
c) continually decreases.
d) changes unpredictably.

the contamination

we are putting to many trash.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.