When a glacier retreats, it leaves barren rock, no soil or plants. What is this an example of? Question 20 options:

Primary succession

Secondary succession

Both

Re-introduction

b is the correct answer

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.

i believe your answer would be c.. : )