Experimenting with carbon dioxide

Since carbon dioxide is denser than air, it accumulates at the bottom

Fish in the aquarium

Without oxygen dissolved in water, fish would die.

The Earth's atmosphere

Farther away from the Earth's surface the atmosphere gets thinner.

Iron sulfide

Iron sulfide does not retain the properties of iron and sulfur.

Reaction of iron powder and sulfur

Iron powder reacts intensely with sulfur while being heated.

Boiling water

Water boils at 100 °C at Earth's standard atmospheric pressure.

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