Which layer of soil often contains litter? a. the a horizon c. the c horizon b. the b horizon d. the bedrock select the best answer from the choices provided a b c d

I think the real answer is O Horizon

But A

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.