422 search results
The frozen planet
Nature & Environment

The frozen planet

...carbon, hydrogen and oxygen atoms, and breathe in air which contains mostly nitrogen atoms. Box 3 The chemical elements Every object on Earth is made of chemical elements. Most elements were created in the nuclear furnaces of exploding stars in the early Universe, so you and the Earth around us are made literally from stardust. There are 109 named elements, of which 92...
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Level 1: Introductory 7 hrs
Galaxies, stars and planets
Science, Maths & Technology

Galaxies, stars and planets

...Carbon 0.2 0.1 0.1 23 26 Iron 0.1 32 5.1 10 Neon 0.1 12 Magnesium 0.1 15 2.1 7 Nitrogen 0.1 2.6 14 Silicon 0.1 16 28 16 Sulfur 0.6 0.1 0.2 28 Nickel 1.8 20 Calcium 1.7 3.7 1.4 13 Aluminium 1.6 8.1 11 Sodium 0.2 2.8 0.1 24 Chromium 0.5 15 Phosphorus 0.1 0.1 1.1 25 Manganese 0.2 0.1 17 Chlorine 0.1 0.1 27 Cobalt 0.1 19 Potassium 2.6 0.2 22 Titanium 0.1 0.6 Footnotes *...
View course Galaxies, stars and planets
Level 1: Introductory 8 hrs
Environment: understanding atmospheric and ocean flows
Nature & Environment

Environment: understanding atmospheric and ocean flows

...carbon dating shows that some are several thousand years old...Environment: understanding atmospheric and ocean flows: 2.3.1 Nansen and the voyage of the Fram - Wood on the shores of Svalbard and East Greenland caused confusion to the first explorers. But when wreckage from a ship called the Jeanette was found on the coast of East Greenland in the late 19th century, the...
View course Environment: understanding atmospheric and ocean flows
Level 1: Introductory 10 hrs
Humphry Davy, laughing gas and the era of self-experimentation
History & The Arts

Humphry Davy, laughing gas and the era of self-experimentation

...hydrogen and carbon dioxide – which left him comatose, the air-bag fortunately falling from his lips. On recovering, he ‘faintly articulated: ‘I do not think I shall die’’. By the end of the summer, the energy of the trials was dissipating: for most of the volunteers, the novelty of the experience wore off after a few sessions. Davy’s...
View article Humphry Davy, laughing gas and the era of self-experimentation
Article 5 mins
Sustainable innovations in enterprises
Money & Business

Sustainable innovations in enterprises

...carbon emissions, uses a quarter of the chemicals produced worldwide each year, and comes just after agriculture in the amount of water it consumes. Those soft cottons that you love, they're almost as bad as the man-made fibres we now tut over because of their petrochemicals. It takes 20,000 litres of water to create one pair of jeans and a single t-shirt. And then we've...
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Level 1: Introductory 9 hrs
The Legacy of Nuclear Power: Part 1
Nature & Environment

The Legacy of Nuclear Power: Part 1

...footprint hidden within vast forests. And you know, it’s interesting to associate these sorts of landscapes with the nuclear question. It’s that sort of menace and that sort of threat and at the same time, there's a population there that is able to mobilise and oppose in the same way as in, I mean Hanford has been transformed. There's a city of a quarter of a million...
View audio The Legacy of Nuclear Power: Part 1
Audio 10 mins
Basic science: understanding experiments
Science, Maths & Technology

Basic science: understanding experiments

...carbon dioxide. And that's the process that makes bread rise in the same way as its doming and making the cling film rise here. Now to monitor the experiment - and keep track of the process - I'm going to measure the thickness of the foam and record how it changes over time. So this one is 2 centimetres thick after five minutes. And this one is 2 centimetres thick. I'll...
View course Basic science: understanding experiments
Level 1: Introductory 12 hrs
Eutrophication
Nature & Environment

Eutrophication

...carbon, nitrogen and phosphorus, have occurred since 1930. Figure 1.11 shows the general pattern of changes in productivity in Cumbrian lakes through history as the type and intensity of human activities has changed. [Figure 1.11] Figure 1.11 Relationship between historical human activities and productivity of lakes in Cumbria, UK. (BP means ‘years before present’.)...
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Level 2: Intermediate 12 hrs