Question

metamorphic rock forms through a process called metamorphism. most rocks are made up of minerals. during metamorphism, minerals in a rock react to form new minerals. this reaction happens because of high temperature, high pressure, or both. when new minerals are formed, a new metamorphic rock is created. for example, gneiss is a type of metamorphic rock. gneiss forms when shale, a type of sedimentary rock, undergoes metamorphism.
shale
complete the following statements about shale and gneiss.
when shale experiences
temperature and pressure, it causes minerals in the shale to react and form new minerals in the gneiss. this process turns shale, a sedimentary rock, into gneiss,
rock.

Explanation:

The text explains that metamorphism occurs under high temperature and pressure, and shale (sedimentary) transforms into gneiss, a metamorphic rock.

Answer:

1. high
2. metamorphic