Hydrogen cycle

Alright kiddo, let me tell you about the hydrogen cycle! So, hydrogen is a gas that is present in the Earth's atmosphere and also in water. The hydrogen cycle refers to the way this gas moves and changes form during different stages in nature.

First, let's talk about when hydrogen is in the air. The sun's energy causes some of the hydrogen in the atmosphere to combine with oxygen to make water vapor. This is called evaporation. When the water vapor cools down, the water droplets come together to form clouds.

Now, let's talk about when hydrogen is in water. The water on our planet is always moving due to the Earth's rotation and the gravity of the moon. This movement of water is called the water cycle. When water falls from clouds as rain or snow, some of it seeps into the ground and becomes groundwater. This groundwater can flow through rocks and soil and eventually make its way to the surface as springs or rivers.

Back to the hydrogen part of the water cycle - some of the water that falls to the ground ends up in bodies of water like lakes and oceans. In these bodies of water, algae and other aquatic plants use energy from the sun to make food through a process called photosynthesis. During photosynthesis, these plants take in carbon dioxide from the air and release oxygen as well as hydrogen.

The hydrogen that is released during photosynthesis can then be used by other living things in the water. For example, fish and other aquatic animals use the hydrogen to create energy in their bodies.

So there you go, that's the hydrogen cycle! From the air to the water and back again, hydrogen is constantly moving and changing throughout nature.