Our Earth

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How Old Is It?

Season 1 | Episode 1 | ABC | February 16, 2010

Earth and environment

7-8 9-10

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 8 years ago

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

Our Earth

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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.

Science

14:59 | Published 9 years ago

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.

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22:06 | Published 5 years ago

Brain Games

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Battle Of The Ages

Our bodies may always be getting older - but your brain doesn't have to act its age! Learn how you might be ageing your brain and how to slow down the clock.

Science

45:39 | Published 4 years ago

Life in the Undergrowth

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Taking to the Air

The second episode of David Attenborough's critically acclaimed Life In The Undergrowth. This program, highlighted by stunning aerobatics by hoverflies in a Bristol garden and the mass migrations of purple crow butterflies in Taiwan, is the story of the winged insects - the first creatures to take to the air.

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51:56 | Published 9 years ago

Absolute Zero

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The Conquest Of Cold

Air-conditioning, refrigeration, and superconductivity are just some of the ways technology has put cold to use. But what is cold, how do you achieve it and how cold can it get? Absolute Zero explores these and other facets of the frigid in two one-hour programs.

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