Whatever is inside the earth is very hot. The trail of clues leads to the model of a metallic core surrounded by a rocky mantle. Huge, slow convection currents rise up, often resulting in earthquakes and volcanoes.
A fossil is a trace of a living thing left in rock. Fossils offer a three-party challenge first to reconstruct the organism itself, then to reconstruct the world lived in, then to understand its place in time and evolution.
Geology as science began with the Industrial Revolution in England. Rock strata were studied and compared and an amazing conclusion was drawn: Our Earth is unbelievably old.
Presented by young scientists, this 7 part series looks at the science of geology: the history of earth and life in rocks. It discusses fossils; the molten core of the earth; tectonic forces; the import of the sun, wind and water on the earth. Geology as a science is recent, beginning in the ...
Volcanoes and earthquakes are only part of a bigger picture. Tectonic forces also push continents around and cause mountains to be uplifted. The crust recycles itself. The lighter rocks of the continents float on the heavier rocks of the mantle.
Share an exciting adventure with two kids, Sandy and Crystal, as they go searching for "Mica's Magic Gemstone." Along the way to their final treasure Sandy and Crystal meet four very interesting characters: Mica-the tour guide, Sir Sediment-ruler of the sedimentary rocks, Iggy ...
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 - ingneous, sedimentary, and metamorphic. These are the basic ingredients of the ...
The forces if the sun, wind and water have changed the face of the 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.
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 rich and cautionary explanations.
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