There were no geologists alive when the bright angel shale layer formed. however, scientists have been able to determine that this rock formed near the shore of an ocean. what evidence could geologists use today to find out about this ancient rock layer?

because people where not alive yet oontill cenoznic era

Explanation:

Scientists could examine rock that formed recently and compare it to Bright Angel Shale. If the recent rock forms near oceans, the Bright Angel Shale rocks may have too.

answer: the answer is b

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.