8 · en
Short, simple sentences with “hydrogen”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
The photosphere is the visible outer layer of the Sun and is mainly composed of hydrogen and helium.
Carbohydrate is a component of carbon, oxygen and hydrogen.
Huge machines will process the lunar rocks to separate the helium-3 from hydrogen, oxygen, carbon, nitrogen and some water molecules.
Please use your oxygen tubes and masks: the atmosphere of this planet is more than a little thick, and is composed of molecular hydrogen gas and helium gas.
Professor Hoyle and two of his colleagues showed that literally everything - including the atoms in our bodies - is made from the hydrogen and helium found inside stars.
There are more than unpleasant memories of the effects of toxic substances: for example, on 24 November 1950, in the Mexican town of Poza Rica, an acid smog caused by hydrogen sulphide affected 300 people, 22 of whom died.
The planets are thought to have formed from a nebula formed by these phases, only the Earth pushed the smaller hydrogen molecules out into space, the enormous gravity of Jupiter (a consequence of its size) trapping and holding them. While the Earth evolved, Jupiter remained as it was born.
Saturn, which contains a lot of hydrogen, may have a smaller, rocky core at its centre (small depending on how you look at it, because it is estimated to be several times the size of the Earth) surrounded by liquid metallic hydrogen. The outermost bed of the planet may be an ocean of liquid hydrogen, among other compounds.
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