A small icy body in the Solar System, with a solid nucleus of rock, dust, ice, and frozen gases such as carbon dioxide, carbon monoxide, and ammonia.
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The planet we live on is the third of the four rocky planets in our Solar System.
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An object in space with enough mass in a relatively small region of space that nothing can escape its gravity, not even light.
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The surface layer of a rocky planet or other astronomical body, usually chemically distinct from the mantle beneath it.
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A large cauldron-like volcanic feature, formed when a chamber full of magma empties and the ground above it collapses.
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A chemical compound typically formed from metal and non-metal elements combining.
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A small molecule that can chemically bond in chains or groups to other similar molecules, to form larger molecules called polymers.
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From 'smoky fog', smog is a form of pollution often associated with cities.
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A bowl-shaped depression, usually circular, in the surface of a planet or moon.
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The formation of solid crystals from a solution, or a cooling liquid or gas.
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A fixed place within the mantle or oceanic lithosphere where rocks melt to generate magma.
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Bonds between atoms that allow the formation of chemical compounds.
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Chemical energy is stored in all compounds, and can be released in chemical reactions.
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A cloud of gas and dust in space.
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A substance that reacts with an acid to form a salt and water.
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The breakdown of rock into smaller pieces by physical and chemical processes at the Earth's surface.
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A general name for a natural satellite of a planet, but also the specific name for Earth's only natural satellite.
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The process by which a single parent cell divides into two or more daughter cells.
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A chemical reaction or process that releases heat.
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In 2005, New Orleans was struck by Hurricane Katrina. What defences did the city have to protect it? Earth Science - Weather - Learning Points. New Orleans, Louisiana USA, straddles the Mississippi river and lies below sea level. New...

Volcanoes are infamously destructive, but they can also be a constructive force. Mt. Kilauea, the world's most active volcano, helped create the islands of Hawaii millions of years ago. Earth Science - Geology - Learning Points. Mount...

The Moon holds Earth in place and dictates our seasons. What happens to planets without a moon like ours? Physics - Our Solar System - Learning Points. The Moon formed after Earth collided with its twin, Theia. In proportion to the size...

Formed deep within the Earth's mantle, diamonds are difficult to find. But it's not just their rarity that makes them so valuable - diamonds have some surprising industrial applications too.



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The collision of comet Shoemaker-Levy 9 with Jupiter in 1993 was the first collision of its kind to be witnessed by man. Physics - Universe - Learning Points. The comet Shoemaker-Levy 9 was discovered orbiting Jupiter in 1993....