There are three main types of rocks: igneous, sedimentary, and metamorphic. Each of these types of rocks are formed in unique ways and each type of rock can be changed into each of the other types of rock. Geologists call this process the rock cycle. Essentially the rock cycle is the process that makes and recycles rocks.
Most rocks on earth began as igneous rocks. Igneous rocks are formed from magma. Magma is melted rock beneath the Earth’s surface. Magma cools and solidifies into rock. When igneous rocks are exposed on the surface, time and weather break the rock down into smaller and smaller pieces. This process is called weathering and erosion. Wind and water carry the smaller pieces of igneous rocks into piles called sediment beds. Over time the sediment beds get buried and the pieces of rock become cemented together to form a new type of rock called a sedimentary rock.
If a sedimentary rock gets buried deep in the Earth, heat and pressure essentially bake the rock, changing it into something new. This process is called metamorphosis, and the new rock is called a metamorphic rock. Metamorphosis can happen to igneous rocks as well. In short, the rock cycle is the name for the rocks and the processes that form them.
For sedimentary rocks the processes are cementation (cemented) and compaction (packed). To form igneous rocks the process is melting and hardening. Heat and pressure form metamorphic rocks.
The rock cycle can start with any rock type and be changed into any rock type depending on the processes that act on it.
1. According to the passage, what type of rock do most rocks start out as?
A. Igneous
B. Sedimentary
C. Metamorphic
D. Magma
2. What would be the best title for this passage?
A. Rocks are Fun to Throw
B. How Rocks are Cooled and Hardened
C. The Processes of How Rocks are Formed
D. 5 Main Types of Rocks
3. What are the processes that turn a sedimentary rock into a metamorphic rock?
A. Cooling and hardening
B. Compacting and cementation
C. Heat and pressure
D. Heating and melting
A.
C.
C.
What is the meaning of igneous
What is the meaning of sedimentary
What is the meaning of metamorphic
What is the meaning of rock cycle
What is the meaning of compacted
Plz help me on this
1. According to the passage, most rocks start out as igneous rocks. (A. Igneous)
To answer this question, we can refer to the information provided in the passage. It states that "Most rocks on earth began as igneous rocks" and goes on to explain how igneous rocks are formed from magma. Therefore, the correct answer is A. Igneous.
2. The best title for this passage would be C. The Processes of How Rocks are Formed.
To determine the best title, we need to identify the main focus of the passage. The passage primarily discusses the rock cycle and the processes involved in the formation of different types of rocks. The title that accurately reflects this main theme is C. The Processes of How Rocks are Formed.
3. The processes that turn a sedimentary rock into a metamorphic rock are heat and pressure. (C. Heat and pressure)
To answer this question, we can refer to the passage which explains that if a sedimentary rock gets buried deep in the Earth, heat and pressure essentially bake the rock, changing it into a metamorphic rock. Therefore, the correct answer is C. Heat and pressure.