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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.

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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:

1 Earth Science Chapter 4 Rocks!

2 Bellwork What is the most interesting thing you learned during your research? Write it down and then we will talk about it!

3 Classifying Rocks Rocks are classified using 1. mineral composition 2. color 3. texture

4 Mineral Content Rocks can be made of one, or a combination of several minerals There are about 20 main rock- building minerals

5 One mineral

6 Several minerals

7 Color Can help identify rocks Granite is usually light Basalt is usually dark

8 Granite/Basalt

9 Texture Grain size Grain shape Grain pattern

10 Grain size Fine-some only seen with microscope Coarse-easily seen without microscope No visible grain-none seen even with microscope

11

12 Grain pattern Bands Swirls Colored bands Random

13 Banded

14 Swirl

15 Colored bands

16 Random

17 Bellwork What did you find most interesting about the crystal presentations?

18 Igneous Formation Igneous: forms from the cooling of magma or lava

19 Igneous formation

20 Sedimentary formation Sedimentary rocks form when particles of other rocks or plant/animal remains are presses and cemented together

21 Sedimentary formation

22 Metamorphic formation Metamorphic formation: forms when an existing rock is changed by heat, pressure, or chemical reactions.

23 Metamorphic formation

24 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

25 Bellwork What type of rock is created when lava is cooled quickly?

26 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

27 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

28 Basalt

29 Origin Intrusive Rock: igneous rock that formed when magma hardened beneath the Earth’s surface Most abundant intrusive rock is granite

30

31 Texture Rapid cooling=small crystals, fine grain Slow cooling=large crystals, coarse grain Extrusive=smooth, fine grain Intrusive=coarse, large grain

32 Texture ExtrusiveIntrusive

33 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

34

35 BELLWORK WHAT DID YOU FIND MOST INTERESTING ABOUT IGNEOUS ROCK FORMATION?

36 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

37 Sedimentary process ErosionDeposition CompactionCementation

38 Erosion Natural forces break down and carry small pieces of rock

39 Erosion

40 Deposition The natural processes eventually drop the eroded rock/sediment and they form layers

41

42 Bellwork Discuss a scientific observation you made recently

43 Compaction This presses the visible layers of sediment together

44 Cementation During compaction, minerals dissolve in water, fill in gaps in the sediment, and act as a glue holding the newborn rock together

45 Cementation

46 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

47 Classifying Sedimentary Rocks Sedimentary rocks ClasticOrganicChemical

48 Clastic Formed from rock fragments being squeezed together They can be small or large rock fragments – Clay/pebbles

49 Bellwork Name three examples of clastic sedimentary rocks

50 Clastic Most common are shale, sandstone, conglomerate, and breccia Most form from sand on beaches, ocean floor, riverbeds, and sand dunes

51 Shale

52 Sandstone

53 Conglomerate

54 Breccia

55 Organic Rocks Remains of plants and animals are deposited in thick layers Coal and limestone are major examples

56 Coal Coal forms from swamp plants buried in water Over millions of years they turn into coal

57

58 Bellwork What are the three main types of sedimentary rocks?

59 Limestone Animals with hard shells made of calcite die and fall to the bottom of the ocean Over millions of years these make limestone

60 Limestone

61 Chemical Rocks Form when dissolved minerals crystalize Examples include ancient sea beds – Could be from salt or dissolved limestone

62 Chemical Rocks

63 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?

64 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?

65 The Rock Cycle Magma

66 Rock Cycle http://PHSchool.com/webcodes10/index.cfm? wcprefix=cfp&wcsuffix=1056&area=view&x=1 4&y=16 http://PHSchool.com/webcodes10/index.cfm? wcprefix=cfp&wcsuffix=1056&area=view&x=1 4&y=16 http://www.youtube.com/watch?v=SRaInMD NyE8 http://www.youtube.com/watch?v=SRaInMD NyE8

67 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

68 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!


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