Our Earth

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Our Earth: How Old Is It?
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How Old Is It?
Season 1  |  Episode 1  |  ABC  |  February 16, 2010

Science

Earth and environment
7-8 9-10
Classification: Not ClassifiedClassification: Not Classified

Geology as science begins with the industrial revolution in England. For the first time rock strata are studied and compared and an amazing conclusion is drawn. Earth is unbelievably old.

Geology as science begins with the industrial revolution in England. For the first time rock strata are studied and compared and an amazing conclusion is drawn. Earth is unbelievably old.

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14:52 | Published 9 years ago
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Our Earth

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Who Needs Geology?

Not only are our cities and almost every product we use derived from the ground, so is almost all our energy. Yet minerals and petroleum products are only the start. Every culture has wondered about the origin and nature of the earth and geology offers a rich and cautionary explanation.

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14:55 | Published 9 years ago
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Rock Recipes

Rocks are complicated collections of mineral particles. Four silicate mineral groups make up 90% of the crustal rocks - mafic minerals, quartzes, feldspars and micas. Rocks come in three basic varieties - igneous, sedimentary and metamorphic. These are the ingredients of the rock cycle.

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14:59 | Published 9 years ago
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Our Earth

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Wear And Tear

The forces of sun, wind and water have changed the face of earth just as much as tectonics. Weathering and erosion are driven by gravity, flattening the landscape. They create soil. Deposition starts the process of forming sedimentary rock.

Science

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