1246 questions and answers in this section
Explain why glaciers are indicators of climate change?

Explain why glaciers are indicators of climate change?

When temperatures rise, glaciers react quickly. They melt. Here, we're talking about ice transforming into water. The glacier loses mass. Scientists measure this loss of...

Read full answer

Explain why are snail shells spiral-shaped?

Explain why are snail shells spiral-shaped?

Snail shells are spiral-shaped due to biological growth and natural mathematical laws. A snail starts off very small, and its shell grows along with it. It coils...

Read full answer

Explain why do headlights use Fresnel lenses?

Explain why do headlights use Fresnel lenses?

Lighthouses operate using a source of intense light, often a bulb or a gas lamp. The light is directed and concentrated by reflectors and lenses. The goal...

Read full answer

Explain why some mushrooms glow in the dark at night?

Explain why some mushrooms glow in the dark at night?

Some mushrooms are phosphorescent thanks to their bioluminescence, a natural phenomenon where living organisms produce light. This ability is due to a chemical reaction in...

Read full answer

Explain why are the southern lights less frequently observed than the northern lights?

Explain why are the southern lights less frequently observed than the northern lights?

The Earth's magnetic field resembles a dipole, with a more intense polarity on the northern side. The aurora borealis thus appears more frequently due to...

Read full answer

Explain why soap bubbles burst more quickly in the summer?

Explain why soap bubbles burst more quickly in the summer?

The evaporative potential skyrockets in the summer. Warm air can absorb more water than cold air. When the temperature rises, the water on the surface...

Read full answer

Explain why some liquids can change color with temperature changes?

Explain why some liquids can change color with temperature changes?

The thermochromic effect occurs when certain materials change color in response to a temperature variation. It's like the magic of cups that change color when...

Read full answer

Explain why can sand grains sing?

Explain why can sand grains "sing"?

Sand grains are small fragments of silica, generally quartz. They measure between 0.0625 mm and 2 mm in diameter. The shape of the grains can...

Read full answer

Explain why do Norwegian fjords have such steep walls?

Explain why do Norwegian fjords have such steep walls?

Millions of years ago, monumental geological forces shaped the Norwegian fjords. The Earth's crust bent, cracked, and lifted. These movements, caused by plate tectonics, created...

Read full answer

Explain why ancient civilizations often used calendars based on the moon?

Explain why ancient civilizations often used calendars based on the moon?

Ancient civilizations used calendars based on the Moon because its cycle is visible and regular. The complete lunar cycle lasts about 29.5 days, which is...

Read full answer