Rock Types & the Rock Cycle - Study Guide

REF STUDY GUIDE: Big Ideas Use to answer form questions

1.Fossils are more than bones and shells. They include trace fossils (footprints, burrows), molds, casts, petrified wood, insects in amber, and even soft-bodied organisms preserved in fine-grained sediment — any preserved evidence of ancient life counts.

2.Rocks transform continuously through the rock cycle. Igneous (cooled magma/lava), sedimentary (compressed sediment), and metamorphic (heat + pressure) rocks convert into one another over millions of years — driven by Earth's internal heat and surface processes like weathering, erosion, and uplift.

3.Layer order can lie — tectonic forces disrupt strata. Folding, faulting, and igneous intrusions can flip, tilt, or interrupt the original horizontality of rock layers, so depth alone doesn't determine age. Marine fossils high on mountain peaks are evidence of seafloor uplift across geologic time.

DRAW KEY TERMS Google each → Images tab → sketch what you see

OTHER VOCAB: weathering · uplift

igneous rock

Rock formed from cooled magma or lava

sedimentary rock

Rock formed from compressed layers of sediment

metamorphic rock

Rock changed by heat and pressure

rock cycle

Continuous process of rock formation and transformation

WRITE FOCUS QUESTION Your initial thinking

In the Himalayan mountains, climbers at over 25,000 feet have cracked open rocks and found perfectly preserved seashells and marine fossils -- ocean creatures locked inside stone at the roof of the world.

How can you find seashells on top of a mountain?

I think...the seashells were originally formed in ocean sediments. Over millions of years, tectonic forces caused the seafloor to uplift, pushing the sedimentary rock layers that contained the fossils up to form mountain ranges like the Himalayas.

WRITE AFTER HOOK FORM Reflect before continuing

I learned that... rocks continuously cycle through different forms over millions of years, and that marine fossils found on mountains are evidence that tectonic forces uplifted ocean-floor sedimentary rock layers to mountain heights.

Station 1 — Rock Classification Lab

I observed that... rock samples had very different textures and structures — igneous rocks had interlocking crystals or glassy texture, sedimentary rocks showed visible layers or cemented particles, and metamorphic rocks had foliated banding or distorted crystal structures.

This shows that... each rock type forms under different conditions: igneous rocks from cooling magma or lava, sedimentary rocks from compressed and cemented particles, and metamorphic rocks from existing rock changed by intense heat and pressure.

The key concept is... rocks can be classified into three types based on how they formed — igneous (cooled magma), sedimentary (compressed sediment), and metamorphic (heat/pressure transformation) — and each type can be identified by its texture and structure.

CHECK DAY 1 CHECK-IN Before you leave

Q1: Based on today's investigation of rock types & the rock cycle, explain one key finding using evidence from your data. Connect your answer to this week's focus question: How can you find seashells on top of a mountain?

One key finding is that each rock type has distinct characteristics that reveal how it formed — igneous rocks have interlocking crystals from cooling magma, sedimentary rocks have visible layers from compressed sediment, and metamorphic rocks have banding from heat and pressure. This connects to seashells on a mountain because seashells are found inside sedimentary rock (limestone), which originally formed on the ocean floor. Tectonic uplift — the same process that drives the rock cycle — pushed those rock layers from the seafloor to mountain heights.

Confidence:

Still building Getting clearer Ready to explain

Station 2 — Rock Cycle Modeling

The data shows... all three rock types are connected by processes like melting and cooling, erosion and compaction, and heat/pressure — forming a continuous cycle over geologic time rather than a one-way sequence.

This connects to... the driving question because the rock cycle explains how sedimentary rocks containing marine fossils could be formed on the ocean floor and then uplifted to form mountains through plate tectonics.

The main idea is... the rock cycle is a continuous, slow process where rocks transform between igneous, sedimentary, and metamorphic types through processes driven by Earth's internal heat and surface forces like weathering and erosion.

This connects to what we learned because...

I can apply this by... predicting that any rock formation today contains clues about past environments — a limestone cliff with shells tells us that area was once an ancient sea floor, while granite tells us there was once volcanic activity deep underground.

DRAW CONCEPT MODEL Show your understanding visually

Draw a model that shows the main concept. Include labels and arrows to explain relationships.

Draw a cycle diagram showing the three rock types (IGNEOUS, SEDIMENTARY, METAMORPHIC) connected by labeled arrows. Include: Cooling → Igneous; Weathering + Erosion + Compaction → Sedimentary; Heat + Pressure → Metamorphic; Melting → back to Igneous. In a corner, add a cross-section of the Himalayas showing ocean sediment layers with fossil seashells being pushed up by converging tectonic plates. Label: 'Original ocean floor' → 'Uplift' → 'Mountain peak.' Teacher: sketch your own exemplar with arrows showing energy sources (Sun at surface, Earth's heat below).

Labels included

Relationships shown

Key terms used

CHECK TEST YOUR THINKING Rate each: FALSE ← 1-2-3-4-5 → TRUE

1. Fossils are only bones or shells — soft tissue and soft-bodied organisms never leave traces.

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2. Rocks don't change once formed — they stay the same type forever.

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3. Deeper rock layers are always older than the layers above them.

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4. All three rock types -- igneous, sedimentary, and metamorphic -- can transform into each other through the rock cycle.

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5. Tectonic forces can fold and flip rock layers, disrupting their original order.

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Pick any TWO statements -- especially any you rated 2, 3, or 4. Justify your rating with evidence:

Statement #___ -- I rated it ___ because:Statement #1 — I rated it 1 because: fossils can also be footprints, burrows, molds, casts, insects preserved in amber, and petrified wood. Soft-bodied organisms like jellyfish have been fossilized in fine-grained sediment. Any preserved evidence of ancient life counts as a fossil, not just hard body parts.

Statement #___ -- I rated it ___ because:Statement #3 — I rated it 1 because: tectonic forces can fold and fault rock layers, completely overturning their original order. When the Indian Plate collided with the Asian Plate, compression tilted limestone layers nearly vertical — so what was originally the bottom can now be the top.

THINK SCIENTIST CIRCLE DEBRIEF Reflect after your Scientist Circle discussion

AHA! Moment

The one I changed my thinking most about is... that deeper rock layers aren't always older — tectonic forces like folding and faulting can completely overturn the original ordering of rock strata, which means you can't assume age from depth without checking for evidence of deformation.

Remaining Question

I still wonder... how long it actually takes for loose ocean sediment to become hard sedimentary rock — and whether scientists can use that rate to calculate exactly how old the Himalayan fossils are.

WRITE FOCUS QUESTION REVISIT Final written response

How can you find seashells on top of a mountain?

Word Bank: igneous rock · sedimentary rock · metamorphic rock · rock cycle · weathering · uplift

Seashells can be found on top of mountains because of two connected processes: sedimentary rock formation and tectonic uplift. The seashells were once living marine organisms in an ancient ocean. When they died, their shells settled on the seafloor and were gradually buried under layers of sediment, forming sedimentary rock through compression and cementation.

Over geologic time, the collision of tectonic plates at a convergent boundary caused these seafloor sedimentary rock layers to be pushed upward through a process called uplift, eventually forming mountain ranges like the Himalayas. Although tectonic forces can fold, flip, and disrupt the original horizontal layering of rock strata,

the fossil seashells preserved inside remain as evidence of the rock's oceanic origin. The rock cycle connects all of this — sedimentary rock formed in the ocean became metamorphic rock under heat and pressure, and was uplifted by the same plate forces that drive rock transformation over millions of years.