Sherman's troops attacked .

Sherman’s policy where troops destroyed anything that might be useful was called
.

The town of
was destroyed so badly that only chimneys remained.

a

explanation:

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.