'Granite pumice obsidian types' diaporamas de présentation

Rocks

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Rocks

Rocks. Sedimentary Rocks. Metamorphic Rocks. Igneous Rocks. Types of Rocks. Sedimentary Rocks How They are Made. Wind and water break down the earth Bits of earth settle in lakes and rivers Layers are formed and build up Pressure and time turn the layers to rock. Sandstone. Limestone.

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Rocks

Rocks. The Life of a Rock. Layers of sediment join together. Changes are made from pressure and heat. Melted rock cools and hardens. Rocks become smaller , and smaller , and smaller , and smaller . . . By erosion By wind By earthquake By floods By rain By slides By man.

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