Video Transcript
Which of the following correctly
identifies the two conditions required to convert igneous or sedimentary rocks to
metamorphic rock? (A) High temperature and high
pressure. (B) High pressure and moisture. (C) Low temperature and low
pressure. (D) Low temperature and a metal
catalyst. (E) High temperature and acidic
conditions.
Igneous, sedimentary, and
metamorphic are the three types of rock. Each type of rock is classified
based on how it is formed. Igneous rocks are formed when
molten material, either magma below the surface or lava above the surface,
cools. Sedimentary rock is formed when
layers of sand and sediment compact and cement together.
Metamorphic rock is made from
already existing igneous or sedimentary rocks deep underground. Rocks deep underground are at a
high pressure. When these rocks are also exposed
to a heat source with a high temperature, such as magma, they can undergo a physical
change. This turns the igneous or
sedimentary rocks into metamorphic rock. Marble is an example of a
metamorphic rock. It is formed when limestone, a
sedimentary rock, is exposed to high temperature and high pressure.
We now know that the two conditions
required to convert igneous or sedimentary rocks to metamorphic rock are high
temperature and high pressure, answer choice (A).
