Grade 4 Science Review worksheet covering Earth's layers, outer planets, and states of matter.

Let's solve each section of this Grade 4 Science Review Worksheet step by step and explain the answers.

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Section 1: Label the Earth Layers

Instructions: Use the words below to label the Earth layers.
Words: *inner core, mantle, crust, outer core*

Look at the diagram of Earth showing four layers from the outside in:

1. (Outermost layer) → This is the crust – the thin, solid outer layer where we live.
2. Next layer inward → The mantle – a thick layer made of hot, semi-solid rock.
3. Next layer inward → The outer core – a liquid layer made mostly of iron and nickel.
4. Innermost layer → The inner core – a solid ball of iron and nickel at the center.

✔ Answers:
1. Crust
2. Mantle
3. Outer core
4. Inner core

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Section 2: Write the names of the four outer planets

The image shows all eight planets in order:
- Mercury, Venus, Earth, Mars (inner planets)
- Jupiter, Saturn, Uranus, Neptune (outer planets)

The four outer planets are:
- Jupiter
- Saturn
- Uranus
- Neptune

Now fill in the blanks under "M", "V", "M", "E" — these are likely initials for planet names.

But looking closely:
- M ___ → Mars (but Mars is an inner planet) — wait, this seems confusing.

Wait — the prompt says: *"Write the names of the four outer planets."* And then there are four blanks labeled:
- M __________
- V __________
- M __________
- E __________

But that doesn’t match the outer planets. Let’s check again.

Actually, the labels are likely meant to be:
- M = Mercury? But Mercury is not outer.
- Wait — maybe it's a typo or mislabeling?

Looking at the diagram:
- It shows the solar system with Mercury, Venus, Earth, Mars on the left (inner planets)
- Then Jupiter, Saturn, Uranus, Neptune on the right (outer planets)

So the four outer planets are:
1. Jupiter
2. Saturn
3. Uranus
4. Neptune

But the worksheet has:
- M ________
- V ________
- M ________
- E ________

That suggests they want the first letters of the outer planets?

But none of the outer planets start with M, V, M, E.

Wait — perhaps the M, V, M, E are just placeholders, and you're supposed to write the names of the outer planets in the blank lines?

Let’s re-read: *"Write the names of the four outer planets."* Then there are four lines, but labeled with M, V, M, E?

Possibility: It might be a mistake, or it's asking to write the names of the four outer planets in the four blanks, regardless of the M/V/M/E labels.

Alternatively, maybe the M, V, M, E are clues for planets?

But:
- M = Mercury? (inner)
- V = Venus? (inner)
- M = Mars? (inner)
- E = Earth? (inner)

No — those are all inner planets.

Ah! Wait — maybe it's a trick.

But the four outer planets are Jupiter, Saturn, Uranus, Neptune.

So the correct answer is:

✔ Four outer planets:
1. Jupiter
2. Saturn
3. Uranus
4. Neptune

So write them in the four blanks.

But why are the blanks labeled M, V, M, E?

Possibly a typo or confusion. Since the instruction is clear: *"Write the names of the four outer planets,"* we should ignore the M/V/M/E and just list the four outer planets.

✔ Answer:
- Jupiter
- Saturn
- Uranus
- Neptune

*(If the M/V/M/E are part of a code, it might be incorrect — but based on standard science, the four outer planets are gas giants and ice giants: Jupiter, Saturn, Uranus, Neptune.)*

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Section 3: Matter – Classify as Solid, Liquid, Gas

Words to classify:
- lemonade
- hot air
- plastic blocks
- stream
- rocks
- juice
- oxygen
- wood
- cola

We need to place each in the correct category: solid, liquid, or gas

Let’s go one by one:

#### Solid:
- Plastic blocks → solid object
- Rocks → solid
- Wood → solid

✔ Solids: plastic blocks, rocks, wood

#### Liquid:
- Lemonade → liquid
- Juice → liquid
- Cola → liquid
- Stream → water flowing → liquid

✔ Liquids: lemonade, juice, cola, stream

#### Gas:
- Hot air → air is a gas
- Oxygen → gas (we breathe it)
- Steam? Wait — “stream” is already used. But “hot air” and “oxygen” are gases.

Note: There's a picture of a kettle with steam — which is water vapor, so gas.

But the word is “stream”, not “steam”. So probably “stream” means a flowing river → liquid.

“Hot air” → gas

“Oxygen” → gas

Is there a word like “steam”? No — but the image shows steam coming from a kettle.

But the word list says: hot air, oxygen — both are gases.

So:

✔ Gases: hot air, oxygen

Wait — what about the person smoking? That’s smoke — also a gas.

But the word is oxygen and hot air — so those are the two gases.

But the word list includes: hot air, oxygen

Also, “stream” is a river → liquid.

So final classification:

| Solid | Liquid | Gas |
|-------|--------|-----|
| plastic blocks | lemonade | hot air |
| rocks | juice | oxygen |
| wood | cola | |
| | stream | |

Wait — we have three solids, four liquids, and two gases.

But the table has three rows per column, so we can fit all.

✔ Final Answer:

Solid:
- plastic blocks
- rocks
- wood

Liquid:
- lemonade
- juice
- cola
- stream

Gas:
- hot air
- oxygen

(Note: “stream” is water, so liquid; “hot air” is gas; “oxygen” is gas.)

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✔ Complete Answers:

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Earth Layers:

1. Crust
2. Mantle
3. Outer core
4. Inner core

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Four Outer Planets:

- Jupiter
- Saturn
- Uranus
- Neptune

*(Even though the M/V/M/E labels may be confusing, the task is to name the four outer planets.)*

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Matter Classification:

| Solid | Liquid | Gas |
|------------------|------------------|-----------------|
| plastic blocks | lemonade | hot air |
| rocks | juice | oxygen |
| wood | cola | |
| | stream | |

> Note: Some categories have more than three items, but the table has only three rows. So we can write:
>
> - Solid: plastic blocks, rocks, wood
> - Liquid: lemonade, juice, cola
> - Gas: hot air, oxygen
>
> (And “stream” is liquid — could go under liquid if space allows, but since only three rows, perhaps prioritize common ones.)

But actually, the worksheet says “Drag the words below in the correct boxes” — and lists 9 words. The table has 3 rows × 3 columns = 9 cells. So likely, each word goes in one box.

Let’s count:
- 3 solids → 3 boxes
- 4 liquids → 4 boxes
- 2 gases → 2 boxes

Total: 9 words → perfect.

So assign:

Solid:
- plastic blocks
- rocks
- wood

Liquid:
- lemonade
- juice
- cola
- stream

Gas:
- hot air
- oxygen

But the table has only three rows per column, so we can’t fit four liquids.

Wait — the table has 3 rows per column, so total 9 cells.

But we have 9 words → so each cell gets one word.

So we must assign:

- 3 solids → 3 cells
- 3 liquids → 3 cells
- 3 gases → 3 cells

But we have:
- 3 solids ✔️
- 4 liquids ✘ (lemonade, juice, cola, stream)
- 2 gases (hot air, oxygen)

So one liquid must be missing?

Wait — let’s double-check the word list:

> lemonade, hot air, plastic blocks, stream, rocks, juice, oxygen, wood, cola

That’s 9 words.

Now:
- Solids: plastic blocks, rocks, wood → 3
- Liquids: lemonade, juice, cola, stream → 4
- Gases: hot air, oxygen → 2

So we have 3 + 4 + 2 = 9 words.

But the table has only 3 rows per column → 9 total cells → so must be exactly 3 in each.

Therefore, perhaps "stream" is not a liquid? But it is.

Wait — maybe "stream" is intended to be "steam"? Because the image shows steam from a kettle.

Yes! That makes sense.

Look at the image: there’s a kettle with steam rising — so the word should be steam, not stream.

Likely a typo: "stream" should be "steam".

Because:
- "Stream" is a river → liquid
- "Steam" is water vapor → gas

And the image matches steam, not stream.

So probably, the word is steam, not stream.

Assuming that, then:

Corrected word list:
- lemonade
- hot air
- plastic blocks
- steam (not stream)
- rocks
- juice
- oxygen
- wood
- cola

Now:
- Solids: plastic blocks, rocks, wood → 3
- Liquids: lemonade, juice, cola → 3
- Gases: hot air, oxygen, steam → 3

Perfect!

✔ So the correct classification is:

| Solid | Liquid | Gas |
|------------------|------------------|-----------------|
| plastic blocks | lemonade | hot air |
| rocks | juice | oxygen |
| wood | cola | steam |

This fits perfectly.

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✔ Final Answer Summary:

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1. Earth Layers:

1. Crust
2. Mantle
3. Outer core
4. Inner core

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2. Four Outer Planets:

- Jupiter
- Saturn
- Uranus
- Neptune

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3. Matter Classification:

| Solid | Liquid | Gas |
|------------------|------------------|-----------------|
| plastic blocks | lemonade | hot air |
| rocks | juice | oxygen |
| wood | cola | steam |

> *(Note: "stream" in the word list is likely a typo — should be "steam" to match the image and logic.)*

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✔ Explanation:

- Earth has four main layers: crust (outer), mantle, outer core, inner core.
- The four outer planets are gas giants and ice giants: Jupiter, Saturn, Uranus, Neptune.
- Matter exists in three states: solids have definite shape and volume, liquids flow and take container shape, gases expand to fill space.
- Correct classification depends on understanding physical state of each item.

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