There are three major types of rock: igneous, sedimentary, and metamorphic. The rock cycle is an important concept in geology which illustrates the relationships between these three types of rock, and magma. When a rock crystallizes from melt (magma and/or lava), it is an igneous rock. This rock can be weathered and eroded, and then redeposited and lithified into a sedimentary rock, or be turned into a metamorphic rock due to heat and pressure that change the mineral content of the rock which gives it a characteristic fabric. The sedimentary rock can then be subsequently turned into a metamorphic rock due to heat and pressure and is then weathered, eroded, deposited, and lithified, ultimately becoming a sedimentary rock. Sedimentary rock may also be re-eroded and redeposited, and metamorphic rock may also undergo additional metamorphism. All three types of rocks may be re-melted; when this happens, a new magma is formed, from which an igneous rock may once again crystallize.
What geology cycle is important?
What does it demonstrate?
Can rocks melt?
What type of rock is formed?
How many types of rock are there?
What type if affected by weather?
Can rocks transform?
How?
When pressure is applied what is created?
When is magma formed?
rock cycle
rock cycle
relationships between three types of rocks
relationships between these three types of rock
yes
 rock crystallizes from melt
igneous
igneous
three
three
igneous
igneous
yes
be turned into a metamorphic rock
heat and pressure
 heat and pressure
unknown
unknown
unknown
unknown