L1: Different Rocks Learning Objectives: 1. Recall the three different types of rocks 2. Describe the characteristics of the different types of rocks.

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Presentation transcript:

L1: Different Rocks Learning Objectives: 1. Recall the three different types of rocks 2. Describe the characteristics of the different types of rocks. 3. Explain how the structure of the different rocks links to their properties.

What is different about these rocks?

Types of Rocks Sedimentary Igneous Metamorphic

Sedimentary Rocks Made of grains (little pieces of rock) with rounded edges Gaps between grains Porous = absorbs water Found in layers Can contain fossils

Igneous Rocks Interlocking crystals Pieces with sharp edges No gaps Not porous No layers

Metamorphic Rocks Interlocking crystals Not porous Found in layers

Can you identify the different rocks? Look at the different rocks around the room and see if you can identify which rocks are: Sedimentary Igneous Metamorphic

Name of RockType of Rock BasaltIgneous ChalkSedimentary ConglomerateSedimentary GabbroIgneous GraniteIgneous LimestoneSedimentary MarbleMetamorphic QuartziteMetamorphic RhyoliteIgneous SandstoneSedimentary SchistMetamorphic SlateMetamorphic

Weathering Weathering = wearing away Types of weathering Chemical Physical

Chemical weathering = weathering caused by substances in air or water having a chemical reaction with the rock

What type of chemical do you think weathers rocks? ACID Rainwater is slightly acidic because carbon dioxide reacts with water to for carbonic acid. However, acid rain from pollution is a stronger acid and weathers rocks more quickly.

Practical: Chemical weathering Put a few drops of dilute acid onto the different types of rocks and write down your observations.

Physical weathering = weathering caused by physical changes such as: changes in temperature freezing and thawing the effects of wind, rain, and water.

Physical Weathering Examples Freeze-Thaw WeatheringTemperature Changes

Physical Weathering Examples Glacial Weathering

Weathering happens to all rocks Suggest which type you think will weather the fastest and explain why. Sedimentary Weakest bonds between the grains Porous, water/acid will get into the rock and weather from the inside or freeze and break the rock.