Presentation on theme: "Earth Science Chapter 4 Rocks!. Bellwork What is the most interesting thing you learned during your research? Write it down and then we will talk about."— Presentation transcript:
Earth Science Chapter 4 Rocks!
Bellwork What is the most interesting thing you learned during your research? Write it down and then we will talk about it!
Classifying Rocks Rocks are classified using 1. mineral composition 2. color 3. texture
Mineral Content Rocks can be made of one, or a combination of several minerals There are about 20 main rock- building minerals
Color Can help identify rocks Granite is usually light Basalt is usually dark
Texture Grain size Grain shape Grain pattern
Grain size Fine-some only seen with microscope Coarse-easily seen without microscope No visible grain-none seen even with microscope
Grain pattern Bands Swirls Colored bands Random
Bellwork What did you find most interesting about the crystal presentations?
Igneous Formation Igneous: forms from the cooling of magma or lava
Sedimentary formation Sedimentary rocks form when particles of other rocks or plant/animal remains are presses and cemented together
Metamorphic formation Metamorphic formation: forms when an existing rock is changed by heat, pressure, or chemical reactions.
You do it! Read section 2 about igneous rocks. Create a classification chart describing how igneous rocks are classified Your chart should include information on origin, texture, and mineral composition of igneous rocks Charts should also include illustrations, all vocabulary words, and examples of igneous rocks
Bellwork What type of rock is created when lava is cooled quickly?
Igneous Rock Classification Origin On or beneath Earth’s surface Texture Depends on the size and shape of mineral crystals Mineral composition Dependent upon the amount of silica in the lava or magma
Origin Extrusive Rock: igneous rock formed from lava that erupted onto Earth’s surface Most common type is basalt Makes up most of the ocean’s floors
Origin Intrusive Rock: igneous rock that formed when magma hardened beneath the Earth’s surface Most abundant intrusive rock is granite
Texture Rapid cooling=small crystals, fine grain Slow cooling=large crystals, coarse grain Extrusive=smooth, fine grain Intrusive=coarse, large grain
Mineral Composition Lava is low in silica and dark colored Magma is high in silica and generally light colored Geologists look at rocks under a microscope to determine the mineral makeup
BELLWORK WHAT DID YOU FIND MOST INTERESTING ABOUT IGNEOUS ROCK FORMATION?
SEDIMENTARY ROCKS READ SECTION 3 WITH A PARTNER MAKE A FLOW CHART DESCRIBING THE FORMATION OF SEDIMENTARY ROCKS YOUR CHART SHOULD INCLUDE: – DEFINITION OF SEDIMENT – 4 STEPS OF THE PROCESS INCLUDING EXPLANATION – ILLUSTRATIONS
Sedimentary process ErosionDeposition CompactionCementation
Erosion Natural forces break down and carry small pieces of rock
Deposition The natural processes eventually drop the eroded rock/sediment and they form layers
Bellwork Discuss a scientific observation you made recently
Compaction This presses the visible layers of sediment together
Cementation During compaction, minerals dissolve in water, fill in gaps in the sediment, and act as a glue holding the newborn rock together
CLASSIFY TYPES OF SEDIMENTARY ROCKS MAKE A CLASSIFICATION CHART DESCRIBING THE THREE MAIN TYPES OF SEDIMENTARY ROCKS CHARTS SHOULD INCLUDE DESCRIPTION OF ALL THREE TYPES HOW THEY FORM EXAMPLES ILLUSTRATIONS
Clastic Formed from rock fragments being squeezed together They can be small or large rock fragments – Clay/pebbles
Bellwork Name three examples of clastic sedimentary rocks
Clastic Most common are shale, sandstone, conglomerate, and breccia Most form from sand on beaches, ocean floor, riverbeds, and sand dunes
Organic Rocks Remains of plants and animals are deposited in thick layers Coal and limestone are major examples
Coal Coal forms from swamp plants buried in water Over millions of years they turn into coal
Bellwork What are the three main types of sedimentary rocks?
Limestone Animals with hard shells made of calcite die and fall to the bottom of the ocean Over millions of years these make limestone
Chemical Rocks Form when dissolved minerals crystalize Examples include ancient sea beds – Could be from salt or dissolved limestone
Section 4 Read Section 4: How do coral animals live? How do coral reefs form? – Illustrate this as well as writing your answer. What evidence do limestone deposits from coral reefs provide about Earth’s history?
On your Own Read Section 5: 1. How are metamorphic rocks formed? 2. How do geologists classify metamorphic rocks? What are the different types of metamorphic rocks? Explain each. What are the uses of metamorphic rocks?
The Rock Cycle Magma
Rock Cycle wcprefix=cfp&wcsuffix=1056&area=view&x=1 4&y=16 wcprefix=cfp&wcsuffix=1056&area=view&x=1 4&y=16 NyE8 NyE8
If you complete the worksheet.. Read section 6: The Rock Cycle 1. Make an illustration of the Rock cycle and describe the steps/changes that occur 2. Answer the questions from all three section assessments 3. You may work with a partner, but every student must have their own work to turn in
When you complete the questions Answer the questions from all three section assessments You may work with a partner, but every student must have their own work to turn in Due Tomorrow!