Deep-sea hydrothermal vents

A hydrothermal vent is a fissure in the planet's surface through which geothermally heated water erupts.

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The four outer planets (Jupiter, Saturn, Neptune and Uranus) do not have solid surfaces, thus...

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This lesson presents deserts and their flora and fauna.

Eratosthenes

The circumference of the Earth has already been calculated in ancient Egypt. The calculations...

Faulting (intermediate)

Vertical forces can break up layers of rock into fault blocks, which then move vertically...

Climate zones

The Earth is divided into geographical and climatic zones, which result in the zonation...

Waterfall

Waterfalls form where the river flows over a steep precipice in its course.

The work of glaciers

A glacier is a large body of ice in constant, slow motion down a hillside.

The Pompeii before time

There is a little village in Northern Hungary in Central Europe that is a hiding place for a...

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