Unit 6 Lesson 2 The Rock Cycle

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Unit 6 Lesson 2 The Rock Cycle Copyright © Houghton Mifflin Harcourt Publishing Company 1

Unit 6 Lesson 2 The Rock Cycle Florida Benchmarks SC.7.E.6.2 Identify the patterns within the rock cycle and relate them to surface events (weathering and erosion) and sub-surface events (plate tectonics and mountain building). LA.6.2.2.3 The student will organize information to show understanding (e.g., representing main ideas within text through charting, mapping, paraphrasing, summarizing, or comparing/contrasting). Copyright © Houghton Mifflin Harcourt Publishing Company 2

Unit 6 Lesson 2 The Rock Cycle Let’s Rock! What is rock? Rock is a naturally occurring solid mixture of one or more minerals and organic matter. Most rock is made of minerals, but some rock is made of nonmineral material that is not organic, such as glass. Rocks are always changing through time. Copyright © Houghton Mifflin Harcourt Publishing Company 3

What processes change rock? Unit 6 Lesson 2 The Rock Cycle What processes change rock? Natural processes make and destroy rock. They change each type of rock into other types of rock and shape Earth’s features. Different natural processes influence the type of rock that is found in each area of Earth’s surface. Copyright © Houghton Mifflin Harcourt Publishing Company 4

What processes change rock? Unit 6 Lesson 2 The Rock Cycle What processes change rock? Water, wind, ice, and changes in temperature can change rock in a number of ways. Weathering is the process by which rock is broken down by water, wind, ice, and changes in temperature. Copyright © Houghton Mifflin Harcourt Publishing Company 5

What processes change rock? Unit 6 Lesson 2 The Rock Cycle What processes change rock? Erosion is the process by which sediment is moved from one place to another. Sediment comes to a rest in a process called deposition. Copyright © Houghton Mifflin Harcourt Publishing Company 6

What processes change rock? Unit 6 Lesson 2 The Rock Cycle What processes change rock? Heat and pressure can change rock. Rock that is buried can be squeezed by the weight of rock or layers of sediment on top. With enough temperature and pressure, buried rock can change into metamorphic rock. Copyright © Houghton Mifflin Harcourt Publishing Company 7

What processes change rock? Unit 6 Lesson 2 The Rock Cycle What processes change rock? In some cases, the rock gets hot enough to melt and form magma, or molten rock. If the magma reaches Earth’s surface, it is called lava. Copyright © Houghton Mifflin Harcourt Publishing Company 8

Classified Information Unit 6 Lesson 2 The Rock Cycle Classified Information What are the classes of rocks? Igneous rock forms when magma cools and hardens. It forms on or beneath Earth’s surface. Sedimentary rock forms when sediment from older rocks gets pressed and cemented together. Metamorphic rock forms when pressure, temperature, or chemical processes change existing rock without melting it. Copyright © Houghton Mifflin Harcourt Publishing Company 9

What are the classes of rocks? Unit 6 Lesson 2 The Rock Cycle What are the classes of rocks? Each rock class can be divided further, based on differences in the way the rocks form. For example, igneous rock is classified based on how and where it forms. Sedimentary rocks are classified according to the size and type of the fragments they contain. Copyright © Houghton Mifflin Harcourt Publishing Company 10

What are the classes of rocks? Unit 6 Lesson 2 The Rock Cycle What are the classes of rocks? Igneous rock forms from molten rock that cools. As molten rock cools, crystals form. The longer the cooling takes, the more time the crystals have to grow. Copyright © Houghton Mifflin Harcourt Publishing Company 11

What are the classes of rocks? Unit 6 Lesson 2 The Rock Cycle What are the classes of rocks? Igneous rocks that form when magma cools beneath Earth’s surface are called intrusive igneous rock. Igneous rocks that form when lava cools on Earth’s surface are called extrusive igneous rock. Copyright © Houghton Mifflin Harcourt Publishing Company 12

What are the classes of rocks? Unit 6 Lesson 2 The Rock Cycle What are the classes of rocks? Metamorphic rocks are formed by high temperatures, high pressures, fluids, and chemicals, or a combination of these factors. These factors change the chemical composition of the rock. Copyright © Houghton Mifflin Harcourt Publishing Company 13

Unit 6 Lesson 2 The Rock Cycle What is the rock cycle? Any of the rock types can be changed into another of the three types. The series of processes in which rock changes from one type to another is called the rock cycle. A rock’s identity can be changed by factors such as temperature, pressure, weathering, and erosion. Copyright © Houghton Mifflin Harcourt Publishing Company 14

Unit 6 Lesson 2 The Rock Cycle What is the rock cycle? Igneous rock that is exposed can break down into sediment. Igneous rock beneath Earth’s surface can change into metamorphic rock. Heat and pressure can change sedimentary rock into metamorphic rock. Metamorphic rock can melt and form magma. Copyright © Houghton Mifflin Harcourt Publishing Company 15

Unit 6 Lesson 2 The Rock Cycle What is the rock cycle? Describe what happens in each part of the rock cycle. Copyright © Houghton Mifflin Harcourt Publishing Company 16

How do tectonic plate motions affect the rock cycle? Unit 6 Lesson 2 The Rock Cycle How do tectonic plate motions affect the rock cycle? Tectonic plate motions can move rock around and result in changing the environment of the rock. Tectonic plate motions can move rock up or down. Uplift is the rising of regions of the crust to higher elevations, causing more erosion. Subsidence is the sinking of regions of the crust to lower elevations, causing basins where sediment is deposited. Copyright © Houghton Mifflin Harcourt Publishing Company 17

How do tectonic plate motions affect the rock cycle? Unit 6 Lesson 2 The Rock Cycle How do tectonic plate motions affect the rock cycle? Tectonic plate motions can pull apart Earth’s surface, creating new surfaces that can be eroded. A rift zone is a set of deep cracks that forms between two tectonic plates that are pulling apart. Copyright © Houghton Mifflin Harcourt Publishing Company 18

How do tectonic plate motions affect the rock cycle? Unit 6 Lesson 2 The Rock Cycle How do tectonic plate motions affect the rock cycle? The rocks in the middle of a rift zone subside, leaving scarps that can be eroded. Sometimes the decrease in pressure at a rift zone causes magma to form and solidify. Copyright © Houghton Mifflin Harcourt Publishing Company 19

Unit 6 Lesson 2 The Rock Cycle Cliff Dwellings Ancient people used rock for their shelter and art. Some of the works they produced in rock are still seen today. The ancient Puebloans in Colorado constructed a castlelike dwelling known as the Cliff Palace. Another group of ancient people carved an elaborate castlelike dwelling in a wall of rock in Jordan. Copyright © Houghton Mifflin Harcourt Publishing Company 20