Igneous Rocks Homework

Hey rock enthusiasts! Mr. Parr, Ms. Kim, and Ms. Urbanak are exploring the mysteries beneath the Earth's surface. They're curious to know: Which type of igneous rock forms when magma cools slowly beneath the Earth's surface?

• Basalt

• Granite

• Pumice

• Obsidian

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DOK Level 1: Recall

Identify the characteristic that is NOT typical of extrusive igneous rocks.

• Fine-grained texture

• Glassy texture

• Large crystals

• Rapid cooling

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DOK Level 2: Skill/Concept

Which of the following is an example of an intrusive igneous rock?

• Basalt

• Andesite

• Granite

• Rhyolite

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DOK Level 1: Recall

Imagine you're a geologist like Mr. Manfra, exploring the mysteries of igneous rocks. How does the rate of cooling affect the crystal size in these rocks?

• Faster cooling forms larger crystals

• Slower cooling forms larger crystals

• Cooling rate does not affect crystal size

• Faster cooling forms smaller crystals, and slower cooling has no effect

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DOK Level 2: Skill/Concept

What is the main difference between intrusive and extrusive igneous rocks?

• Intrusive rocks are always darker in color

• Extrusive rocks form inside the Earth

• Intrusive rocks cool slowly and have larger crystals

• Extrusive rocks are more dense

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DOK Level 2: Skill/Concept

Imagine you're a scientist with Ms. Romer and Mrs. Magna, and you're observing magma cooling at an incredibly fast rate. What do you predict will happen to the rock formation?

• The rock will have very large crystals

• The rock will be completely smooth with no crystals

• The rock will have a mixed texture with some areas smooth and some crystalline

• The rock will have a uniform medium-sized crystalline structure

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DOK Level 3: Strategic Thinking

Design an experiment to compare the crystal sizes in igneous rocks formed at different cooling rates.

• Measure the density of rocks formed at different temperatures

• Observe and record the crystal sizes in rocks cooled at different rates

• Test the hardness of rocks formed under different atmospheric pressures

• Compare the color variations in rocks cooled slowly and rapidly

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DOK Level 4: Extended Thinking

Ms. Bookspan and Ms. Gacevic are on a field trip exploring volcanic regions when they stumble upon some cool rocks. They're curious to know: Which rock is formed from the cooling of volcanic ash on Earth's surface?

• Intrusive Igneous Rock

• Extrusive Igneous Rock

• Foliated Metamorphic Rock

• Organic Sedimentary Rock

Answer explanation

Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth's surface.

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NGSS.MS-ESS2-1

Mr. Keiser is curious about how igneous rocks are formed. Can you help him figure it out?

• heat and pressure

• melting and cooling

• weathering and erosion

Imagine Ms. Feinhals and Mrs. Dransfield are on a volcanic adventure! They discover that igneous rocks form from the __________ of magma or lava. What's the correct term for this process?

• Pressure

• Cooling

• Heat

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NGSS.MS-PS1-4

NGSS.MS-PS3-4