oxygen

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20 08, 2017

Why is the sky blue? Weather science

By |2017-08-20T23:42:12-07:00August 20th, 2017|Physics|0 Comments

Blue sky with cirrus clouds This is an easy question to ask but the answer is pretty hard. The light that comes from the Sun to Earth looks white, but really it is made up of all different colors of light mixed together. You can see this by using a glass of water or a glass prism to break up [...]

19 08, 2017

What’s the atmosphere? Weather science

By |2019-02-05T05:47:27-07:00August 19th, 2017|Physics|0 Comments

Earth's atmosphere: Did the Earth look like this right after it cooled down? What is the atmosphere? The atmosphere is the air that is wrapped all around a planet. Read more about planets Why is the sky blue? All our physics articles Do all planets have atmospheres? Not all planets have atmospheres. In order [...]

18 08, 2017

Mars, the red planet – Astronomy

By |2018-05-31T11:49:29-07:00August 18th, 2017|Physics|0 Comments

Mars, the way the planet looks from space The closest planet to Earth is Mars, and Mars is also the planet that seems most likely to have life on it besides our own Earth. It's the next planet further away from the Sun after Earth. When you look at Mars from Earth, it looks reddish, and even [...]

26 06, 2017

What is quartz? Igneous rock

By |2018-09-06T07:27:12-07:00June 26th, 2017|Geology|0 Comments

What is quartz? A chunk of white quartz What is quartz made of? Quartz is an igneous rock made out of molecules of silicon and oxygen atoms held together in a crystal pattern. All of the silica and oxygen that make quartz came originally from the insides of stars, and it shot out [...]

25 06, 2017

Feldspar rock – a kind of igneous rock

By |2019-06-07T19:17:22-07:00June 25th, 2017|Geology|0 Comments

A feldspar rock quarry in India Is feldspar rare? Feldspar is a very common igneous rock. More than half of the Earth's crust is made of feldspar. What are igneous rocks? All our geology articles What is feldspar made of? When molecules of aluminum, silica and oxygen get together with potassium, they combine [...]

23 06, 2017

What happened in the Archaean Eon?

By |2019-01-31T05:48:29-07:00June 23rd, 2017|Geology|4 Comments

Archaean Eon: A volcano erupts out of the water The beginning of the Archaean Eon After the end of the Hadean Eon is the beginning of the Archaean Eon. That's about 3.8 billion years ago. Earth was still about three times as hot as it is today. But it was no longer hot enough to [...]

2 06, 2017

What is water made of? Molecules and chemistry

By |2017-06-02T18:02:44-07:00June 2nd, 2017|Chemistry|0 Comments

A big ocean wave The first molecules of water formed out in space, about 14 billion years ago, as part of the nebula left over after an early star exploded in a supernova. There were a lot of hydrogen and oxygen atoms floating around in these nebulae, and when they stuck together that [...]

2 06, 2017

What is oxygen? Atoms, elements, chemistry

By |2018-04-24T14:46:22-07:00June 2nd, 2017|Chemistry|0 Comments

Diagram of an oxygen atom When a star has changed all of its hydrogen atoms into helium, it turns into a red giant and moves on to convert the helium atoms into carbon atoms and oxygen atoms. All of the oxygen in the universe starts out inside stars. Then when all the helium is used up, [...]