6th grade igneous rock worksheet by Lauren Allen | TPT - Free Printable

Problem Overview:

The task involves filling out a chart about igneous rocks and answering questions related to them. The chart is partially filled, and the goal is to complete it and provide answers to the questions.

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Step 1: Complete the Chart

The chart provided is about Igneous Rocks. Igneous rocks are classified into two main types based on how they form:

1. Intrusive (Plutonic) Rocks: These form from magma cooling slowly beneath the Earth's surface.
2. Extrusive (Volcanic) Rocks: These form from lava cooling quickly on the Earth's surface.

#### Filling in the Chart:
- Igneous Rock
- Types:
- Intrusive
- Extrusive
- Examples:
- Intrusive: Granite, Gabbro
- Extrusive: Basalt, Andesite

So, the completed chart looks like this:

```
Igneous Rock
|
|------------------- Types -------------------
| |
| Intrusive Extrusive
| |
|-------------------------------------------|
| Examples Examples
| |
| Granite, Gabbro Basalt, Andesite
```

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Step 2: Answer the Questions

Now, let's answer the questions provided in the task:

#### Question 1: Where would you find intrusive rock?
- Answer: Intrusive rocks are found beneath the Earth's surface because they form when magma cools and solidifies slowly underground. Examples include granite and gabbro.

#### Question 2: Where would you find extrusive rock?
- Answer: Extrusive rocks are found on the Earth's surface because they form when lava cools and solidifies quickly after being erupted from a volcano. Examples include basalt and andesite.

#### Question 3: What's the difference between magma and lava?
- Answer: Magma is molten rock that remains beneath the Earth's surface, while lava is molten rock that has erupted onto the Earth's surface. In other words, magma becomes lava when it reaches the surface.

#### Question 4: Which one makes intrusive rock?
- Answer: Intrusive rocks are made from magma. When magma cools and solidifies slowly beneath the Earth's surface, it forms intrusive rocks like granite and gabbro.

#### Question 5: Which one makes extrusive rock?
- Answer: Extrusive rocks are made from lava. When lava cools and solidifies quickly on the Earth's surface, it forms extrusive rocks like basalt and andesite.

#### Question 6: Why is it that scoria and pumice have so many holes in them and are good for pumice stones?
- Answer: Scoria and pumice are extrusive igneous rocks with many holes because they cool very quickly on the Earth's surface. During their rapid cooling, gases trapped in the lava expand and create bubbles, which leave behind small cavities or holes when the rock solidifies. This porosity makes them lightweight and useful for various purposes, such as cleaning tools (pumice stones) and insulation materials.

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Final Answers:

1. Intrusive rocks are found beneath the Earth's surface.
2. Extrusive rocks are found on the Earth's surface.
3. Magma is molten rock beneath the surface, while lava is molten rock on the surface.
4. Magma makes intrusive rock.
5. Lava makes extrusive rock.
6. Scoria and pumice have many holes because gases trapped in the lava expand during rapid cooling, creating bubbles that leave cavities in the rock.

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Final Answer Box:

$$
\boxed{
\text{1. Beneath the Earth's surface.}
\text{2. On the Earth's surface.}
\text{3. Magma is beneath the surface; lava is on the surface.}
\text{4. Magma.}
\text{5. Lava.}
\text{6. Rapid cooling traps gases, creating bubbles and holes.}
}
$$