Rock cycle diagram for educational review, illustrating transformations between magma, igneous, sedimentary, and metamorphic rocks.

To solve the problem of labeling the rock cycle diagram, we need to understand the processes and transformations that rocks undergo in the rock cycle. The rock cycle involves the transformation of rocks from one type to another through various geological processes such as melting, cooling, weathering, erosion, compaction, and metamorphism.

Key Terms Provided:

1. magma
2. igneous rock
3. cooling and hardening
4. heat and pressure
5. melting
6. sedimentary rock
7. weathering and erosion
8. pressure and cementing
9. sediment
10. metamorphic rock

Steps to Label the Diagram:

#### 1. Identify the Starting Points:
- Magma: This is the starting point for igneous rocks.
- Sediment: This is the starting point for sedimentary rocks.

#### 2. Understand the Processes:
- Cooling and Hardening: Magma cools and hardens to form igneous rocks.
- Weathering and Erosion: Igneous and metamorphic rocks undergo weathering and erosion to form sediment.
- Pressure and Cementing: Sediment is compacted and cemented to form sedimentary rocks.
- Heat and Pressure: Sedimentary and igneous rocks are subjected to heat and pressure to form metamorphic rocks.
- Melting: Any type of rock can melt back into magma under high temperatures.

#### 3. Label the Diagram:
- The diagram shows a cyclic flow with arrows indicating the direction of transformation. We will place the terms in the boxes and label the arrows with the processes.

Labeling the Diagram:

#### Box 1 (Top Left):
- Igneous Rock: This is formed when magma cools and hardens.
- Arrows Leading to Igneous Rock:
- From Magma: Labeled as "cooling and hardening."

#### Box 2 (Top Center):
- Magma: This is the molten material beneath the Earth's surface.
- Arrows Leading to Magma:
- From Igneous Rock, Sedimentary Rock, and Metamorphic Rock: Labeled as "melting."

#### Box 3 (Top Right):
- Sedimentary Rock: This is formed from sediment through compaction and cementation.
- Arrows Leading to Sedimentary Rock:
- From Sediment: Labeled as "pressure and cementing."

#### Box 4 (Bottom Left):
- Sediment: This is the result of weathering and erosion of rocks.
- Arrows Leading to Sediment:
- From Igneous Rock and Metamorphic Rock: Labeled as "weathering and erosion."

#### Box 5 (Bottom Right):
- Metamorphic Rock: This is formed from sedimentary or igneous rocks under heat and pressure.
- Arrows Leading to Metamorphic Rock:
- From Sedimentary Rock and Igneous Rock: Labeled as "heat and pressure."

Final Labeled Diagram:

```
Igneous Rock
|
v
Magma
/ \
/ \
v v
Weathering/Erosion Heat/Pressure
| |
v v
Sediment Metamorphic Rock
| |
v v
Pressure/Cementing Melting
|
v
Sedimentary Rock
```

Explanation of Each Step:

1. Magma → Igneous Rock: Magma cools and hardens to form igneous rocks.
2. Igneous Rock → Sediment: Igneous rocks undergo weathering and erosion to form sediment.
3. Sediment → Sedimentary Rock: Sediment is compacted and cemented to form sedimentary rocks.
4. Sedimentary Rock → Metamorphic Rock: Sedimentary rocks are subjected to heat and pressure to form metamorphic rocks.
5. Metamorphic Rock → Magma: Metamorphic rocks can melt back into magma.
6. Igneous Rock → Magma: Igneous rocks can also melt back into magma.
7. Sedimentary Rock → Magma: Sedimentary rocks can melt back into magma.

Final Answer:

The labeled diagram represents the rock cycle, showing how rocks transform through various processes. The key is to ensure that each process (e.g., cooling and hardening, weathering and erosion, etc.) is correctly associated with the appropriate transformation.

$$
\boxed{
\text{See the labeled diagram above for the final answer.}
}
$$