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. QUESTIONS:

Q1:
1. What is a necessary cycle of geology?
2. What geological cycle is vital?
3. 
Q2:
1. What does the rock cycle demonstrate?
2. What is revealed by the rock cycle?
3. 
Q3:
1. Is it possible for rocks to melt?
2. Are rocks capable of melting?
3. 
Q4:
1. What kind of rock does melting form?
2. Which sort of rock comes out of being melted?
3. 
Q5:
1. How many kinds of rocks exist?
2. What is the number of rock types?
3. 
Q6:
1. What type of rock is affected by the weather?
2. Which sort of rock depends on the weather?
3. 
Q7:
1. Are rocks capable of transformation?
2. Is it possible for rocks to change?
3. 
Q8:
1. How do rocks change?
2. What causes rocks to undergo transformation?
3. 
Q9:
1. What is created when pressure is applied to a rock?
2. What comes out of putting pressure on rocks?
3. 
Q10:
1. When does magma come about?
2. At what point does magma form?
3. 
