Students complete nine sentences about obsidian cooling quickly to form a glassy igneous rock, sandstone's sand grain composition, and marble forming when limestone is transformed by heat and pressure. The matching activity pairs igneous, sedimentary, metamorphic, and mineral with their formation descriptions.
Connecting specific rock examples to their formation processes builds the concrete knowledge that supports flexible rock cycle reasoning.
Style:
Rocks and Minerals
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Obsidian is an igneous rock that forms when lava cools quickly.
2. Sandstone is a sedimentary rock made mostly of grains of sand.
3. Marble is a metamorphic rock formed from limestone.
4. Fossils are most commonly found in sedimentary rocks.
5. The Mohs scale ranks minerals from 1 to 10 by their hardness.
6. Talc has a hardness of 1 and diamond has a hardness of 10 on the Mohs scale.
7. Pumice is a light igneous rock that floats on water because it is full of tiny holes.
8. Slate is a metamorphic rock formed from the sedimentary rock shale.
9. Conglomerate is a sedimentary rock made of rounded pebbles cemented together.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
igneous
→ formed from cooled magma or lava
single natural substance with a crystal structure
sedimentary
→ formed from compressed layers of sediment
formed from cooled magma or lava
metamorphic
→ changed by heat and pressure
changed by heat and pressure
mineral
→ single natural substance with a crystal structure
formed from compressed layers of sediment
Rocks and Minerals
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) Obsidian is an igneous rock that forms when lava cools quickly.
2) Sandstone is a sedimentary rock made mostly of grains of sand.
3) Marble is a metamorphic rock formed from limestone.
4) Fossils are most commonly found in sedimentary rocks.
5) The Mohs scale ranks minerals from 1 to 10 by their hardness.
6) Talc has a hardness of 1 and diamond has a hardness of 10 on the Mohs scale.
7) Pumice is a light igneous rock that floats on water because it is full of tiny holes.
8) Slate is a metamorphic rock formed from the sedimentary rock shale.
9) Conglomerate is a sedimentary rock made of rounded pebbles cemented together.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
igneous
→ formed from cooled magma or lava
single natural substance with a crystal structure
sedimentary
→ formed from compressed layers of sediment
formed from cooled magma or lava
metamorphic
→ changed by heat and pressure
changed by heat and pressure
mineral
→ single natural substance with a crystal structure
formed from compressed layers of sediment
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10 Questions
10-15 minutes
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