Educational worksheet explaining the formation of metamorphic rocks with a diagram and interactive questions.

Let’s go step by step through the worksheet.

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Part 1: Fill in the blanks (Lesson Review)

We’re learning how metamorphic rocks form. Metamorphic rocks are made when existing rocks change because of heat, pressure, or hot water — but they don’t melt! If they melted, they’d become igneous rocks.

Let’s fill in each blank:

1. When a rock is changed into another rock and released to the space provided.
→ This sentence seems incomplete or misphrased. But based on context, it probably means: “When a rock is changed into another rock due to heat and/or pressure.” So we’ll assume the blank is for “heat and pressure” or similar. But looking at standard curriculum, this might be referring to “metamorphism”. However, since it says “released to the space provided”, maybe it’s asking for what causes the change? Let’s look ahead.

Actually, let’s read all questions first to get context.

2. Metamorphic rocks can form from ______ rocks or ______ rocks.
→ Any type of rock can become metamorphic: igneous, sedimentary, or even other metamorphic rocks. So answer: *igneous* and *sedimentary* (or “any” but usually they want those two).

3. Some metamorphic rocks have layers called ______ that form as minerals align under pressure.
→ That’s “foliation”. Foliated rocks like slate or gneiss have layers.

4. Rocks can undergo changes when buried deep underground where temperatures exceed 800°C; minerals may melt.
→ Wait — if minerals melt, it’s no longer metamorphic! Metamorphism happens WITHOUT melting. So this statement is tricky. Actually, above ~800°C, most rocks start to melt → becomes magma → igneous rock. So perhaps the blank is “melt”? But the question says “minerals may ______”. Answer: *melt*. But note: once melted, it’s not metamorphic anymore.

Wait — re-reading: “Rocks can undergo changes when buried deep... where temps exceed 800°C; minerals may ______.” In real geology, partial melting can happen during high-grade metamorphism, forming migmatites. But for middle school level, they usually say “if it melts, it’s not metamorphic”. Hmm. Maybe the blank is “recrystallize”? No — recrystallization happens at lower temps. At >800°C, melting occurs. I think the expected answer here is “melt”.

But let’s check next ones.

5. Heat comes from ______ close to Earth’s surface.
→ Heat comes from magma or intrusions near the surface. So: *magma* or *intrusive igneous bodies*.

6. Pressure increases with depth because of the weight of overlying rocks. The greater the depth, the ______ the pressure.
→ Greater depth = more weight = higher pressure. So: *greater* or *higher*.

7. Hot fluids moving through cracks in rocks can cause chemical changes. These fluids often come from ______.
→ Hot fluids usually come from magma or groundwater heated by magma. So: *magma* or *hot springs* — but best answer: *magma*.

8. The diagram shows different zones around an intrusion. Zone A is closest to the magma. What kind of rock would you expect to find there?
→ Closest to magma = highest heat = possible melting or very high-grade metamorphism. Could be hornfels (non-foliated) or even partial melt. But typically, contact metamorphism produces non-foliated rocks like marble or quartzite. Since it’s right next to magma, likely *hornfels* or just “metamorphic rock with no foliation”.

But wait — the diagram has labels: Magma, Contact Metamorphism, Regional Metamorphism, etc.

Looking at the diagram description (even though we can’t see it, from text):

It mentions:
- Magma rising
- Zones labeled A, B, C, D
- Arrows showing direction of heat/pressure

Typical setup:
- Zone A: closest to magma → contact metamorphism → non-foliated rocks
- Zone B: farther out → less intense
- Zone C/D: regional metamorphism → foliated rocks due to pressure

So for question 8: “What kind of rock would you expect to find in zone A?” → Non-foliated metamorphic rock, e.g., hornfels, marble, quartzite.

But let’s do the Skill Challenge part now.

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Skill Challenge Questions:

These refer to the diagram (which we infer from typical textbook diagrams).

Assume the diagram shows:
- A magma body intruding into layered rocks.
- Around it, zones of metamorphism:
- Zone A: immediate contact → high temp, low pressure → contact metamorphism → non-foliated
- Zone B: slightly farther → moderate temp/pressure
- Zone C: deeper/broader area → regional metamorphism → foliated
- Zone D: farthest → least affected

Also, arrows show heat radiating outward, and pressure increasing downward.

Now answer each:

1. Could the temperature change in Zone A change a rock into a metamorphic rock? Explain.

Yes. Even without high pressure, high temperature alone (from nearby magma) can cause contact metamorphism. Minerals recrystallize without melting, forming new metamorphic rocks like hornfels or marble. So yes — heat from magma in Zone A can create metamorphic rock.

2. What could cause a rock in Zone C to change into a metamorphic rock?

Zone C is likely under both heat AND pressure (regional metamorphism). Causes: burial deep underground (pressure from overlying rocks) + heat from Earth’s interior or nearby magma. Also, tectonic forces squeezing rocks together.

3. What kind of rock could be formed by the magma in Zone D?

Zone D is farthest from magma — so probably not directly affected by it. But if magma reaches Zone D and cools, it forms IGNEOUS rock. The question says “formed by the magma”, so regardless of location, if magma solidifies, it makes igneous rock. Example: granite (if cooled slowly), basalt (if fast).

But wait — Zone D might be where magma doesn’t reach. Re-read: “What kind of rock could be formed by the magma in Zone D?” — implies magma is present in Zone D? Unlikely. Probably typo or mislabel. More logically: if magma enters Zone D and cools → igneous rock. Or if Zone D is where original rock was, and gets metamorphosed → metamorphic. But question specifically says “formed by the magma”, so must mean: when magma cools in that zone → igneous rock.

Answer: Igneous rock (e.g., granite or diorite depending on composition).

4. What happens to material that falls below the magma chamber?

Material falling below magma chamber would be subjected to extreme heat and pressure. It might melt completely → become magma again. Or if not fully melted, undergo high-grade metamorphism. Eventually, if melted, it joins the magma pool.

In simple terms: It gets so hot it may melt and become part of the magma.

5. What force shown in the diagram can cause metamorphic rocks to form?

Two main forces: HEAT and PRESSURE.

From diagram:
- Heat comes from magma (radiating outward)
- Pressure comes from overlying rocks (increasing with depth) and possibly tectonic compression (arrows pushing sides)

So answers: Heat from magma, and pressure from overlying rocks / tectonic forces.

Specifically, the diagram likely shows:
- Upward arrow from magma → heat
- Downward arrows on top → pressure from weight
- Sideways arrows → tectonic pressure

So any of these can cause metamorphism.

Best answer: Heat from magma and pressure from overlying rocks or tectonic movement.

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Now back to Lesson Review blanks — let’s finalize them with standard answers:

1. When a rock is changed into another rock and released to the space provided.
→ This is poorly worded. Likely meant: “When a rock is changed into another rock due to ______.” Answer: *heat and pressure*

But original says “and released to the space provided” — maybe it’s a printing error. Perhaps it’s “When a rock is changed into another rock, the process is called ______.” Then answer: *metamorphism*

Given common worksheets, I think #1 is: “When a rock is changed into another rock, the process is called metamorphism.”

But the text says “and released to the space provided” — confusing. Maybe ignore that phrase? Or perhaps “released” refers to gases/fluids? Not clear.

Alternative interpretation: Maybe it’s “When a rock is changed into another rock and [the old minerals are] released...” — still odd.

Perhaps it’s a fill-in for “parent rock”? No.

Let me look at standard definitions.

Common opening: “Metamorphic rocks form when existing rocks are changed by heat, pressure, or hot fluids.”

So for #1: Possibly “existing” or “parent” — but sentence structure doesn’t fit.

Another idea: Maybe it’s “When a rock is changed into another rock, the original rock is called the ______.” Then answer: *parent rock*

That makes sense! And “released to the space provided” might be a red herring or misprint.

I think safest assumption: #1 is asking for “parent rock” — the original rock before metamorphism.

Confirming with logic: All metamorphic rocks come from pre-existing rocks — those are called parent rocks.

So:

1. parent rock
2. igneous, sedimentary
3. foliation
4. melt
5. magma
6. greater
7. magma
8. non-foliated metamorphic rock (like hornfels)

For Skill Challenge:

1. Yes, heat from magma in Zone A can cause contact metamorphism, changing the rock without melting it.
2. Heat and pressure from deep burial and/or tectonic forces.
3. Igneous rock (since magma cools to form igneous rock).
4. It may melt and become part of the magma.
5. Heat from magma and pressure from overlying rocks or tectonic compression.

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Final Answer:

Lesson Review:

1. parent rock
2. igneous, sedimentary
3. foliation
4. melt
5. magma
6. greater
7. magma
8. non-foliated metamorphic rock (such as hornfels)

Skill Challenge:

1. Yes. The heat from the magma in Zone A can cause contact metamorphism, which changes the rock’s minerals without melting it, forming a metamorphic rock.
2. High temperature and high pressure from being buried deep underground or squeezed by tectonic forces.
3. Igneous rock (because when magma cools and solidifies, it forms igneous rock).
4. It will likely melt due to the intense heat and become part of the magma.
5. Heat from the magma and pressure from the weight of overlying rocks or tectonic forces pushing on the rocks.