1290 questions and answers in this section
Explain why marine algae are an important source of oxygen in the ocean?

Explain why marine algae are an important source of oxygen in the ocean?

Marine algae function exactly like land plants: they use solar energy to transform carbon dioxide (CO₂) into oxygen and nutrients. In the ocean, most of...

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Explain why atmospheric pressure varies with altitude?

Explain why atmospheric pressure varies with altitude?

Atmospheric pressure is simply the weight exerted by the air present in the atmosphere on a given surface. Just imagine a huge column of air...

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Explain why water appears calm on the surface of a lake, even in windy weather.

Explain why water appears calm on the surface of a lake, even in windy weather.

When a lake receives wind, at first glance it should easily create small waves. But the surface of the water has a sort of soft...

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Explain why mosquitoes bite us?

Explain why mosquitoes bite us?

Only female mosquitoes bite us, as they need human blood for the development of their eggs. Males, on the other hand, are satisfied with a...

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Explain why earthquakes mainly occur along faults?

Explain why earthquakes mainly occur along faults?

A fault is a fracture in the rocks of the Earth's crust. When the rock blocks on either side of this fault suddenly move, it...

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Explain why aluminum does not rust like iron?

Explain why aluminum does not rust like iron?

When aluminum is exposed to air, it quickly reacts with the oxygen present, forming a thin layer of aluminum oxide. This protective layer is ultra-thin, transparent, and...

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Explain why chimney fires smoke?

Explain why chimney fires smoke?

When you light a fire in your fireplace, the wood heats up, releasing gases from its combustion. These gases normally burn when they reach a...

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Explain why sandstorms can travel thousands of kilometers.

Explain why sandstorms can travel thousands of kilometers.

The formation of a sandstorm often begins with prolonged periods of drought and intense heat. The soil, completely dried out, loses its protective vegetative layer, making it...

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Explain why quartz crystals form in hexagons?

Explain why quartz crystals form in hexagons?

Quartz is essentially silicon dioxide (SiO₂) organized at the atomic scale in the form of regular networks. Specifically, each silicon atom is surrounded by four...

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Explain why fog can suddenly appear without warning?

Explain why fog can suddenly appear without warning?

Fog is simply a large cloud close to the ground, made up of tiny water droplets suspended in the air. For it to form, humid...

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