1290 questions and answers in this section
Explain why frogs can change color?

Explain why frogs can change color?

Frogs change color thanks to specialized cells in their skin called chromatophores. These cells contain different pigments, such as melanin, which gives dark tones, pteridine...

Read full answer

Explain why magnets attract or repel each other?

Explain why magnets attract or repel each other?

The magnetic phenomenon mainly comes from the movement of electrons within atoms. Each electron has a small natural magnetic field, due to its own movement...

Read full answer

Explain why hail showers are often localized.

Explain why hail showers are often localized.

Thunderstorm cells form quickly and often remain limited to small areas, which gives the impression of highly localized phenomena. It usually begins with a mass...

Read full answer

Explain why are the oceans salty and not fresh like the freshwater of rivers.

Explain why are the oceans salty and not fresh like the freshwater of rivers.

When it rains, water flows over the rocks and soils. As it flows toward the sea, it carries away mineral salts contained in these rocks, especially sodium...

Read full answer

Why do fjords have such unique shapes?

Why do fjords have such unique shapes?

Fjords come from the passage of ancient glaciers, incredibly heavy and massive, that slowly slid toward the sea, scraping and hollowing out the rock along...

Read full answer

Explain why waves can carry ocean debris for thousands of kilometers?

Explain why waves can carry ocean debris for thousands of kilometers?

The wind is the main engine that drives the waves across the oceans. Typically, the stronger and longer it blows, the more energy it imparts...

Read full answer

Explain why some animals change their skin or feathers depending on their environment.

Explain why some animals change their skin or feathers depending on their environment.

Changing skin or feathers helps many animals blend into their surroundings. Camouflage is like wearing military camouflage gear, but in an animal version and cooler. For example,...

Read full answer

Can you explain why jellyfish have such a unique shape?

Can you explain why jellyfish have such a unique shape?

The shape of a bell or umbrella in jellyfish is not just for aesthetics; it provides a significant advantage for their movement in water. Their...

Read full answer

Explain why frost forms on windows?

Explain why frost forms on windows?

The temperature plays an essential role in the formation of frost on windows because when it drops, the humid air inside reaches its famous dew...

Read full answer

Explain why crumpled paper becomes stronger after being hot-pressed.

Explain why crumpled paper becomes stronger after being hot-pressed.

When you crumple paper, the cellulose fibers it contains get tangled and disorganized. When you then smooth this paper with heat, these heated fibers regain...

Read full answer