98 questions and answers in this section
Explain why air quality in the mountains can impact athletes' performance at high altitudes.

Explain why air quality in the mountains can impact athletes' performance at high altitudes.

As you ascend to higher altitudes, the air becomes thinner: less concentrated, less dense, but still composed of 21% oxygen. So, even though the percentage...

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Explain why the wind can extinguish a flame but fuel a fire.

Explain why the wind can extinguish a flame but fuel a fire.

A flame needs heat, fuel (like the wax of a candle), and oxygen. A slight gust of wind can abruptly cool the flame by dispersing...

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Explain why the Epupa Falls are important to the residents.

Explain why the Epupa Falls are important to the residents.

The Epupa Falls hold powerful significance for the Himba people, who have always inhabited this region. They represent a sacred place closely tied to their...

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Explain why the sea is blue?

Explain why the sea is blue?

The sun emits white light, which combines all visible colors. When this light hits water, each color reacts differently. The red, orange, and yellow wavelengths...

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Explain why do penguins swim so quickly underwater despite their clumsy appearance on land?

Explain why do penguins swim so quickly underwater despite their clumsy appearance on land?

Penguins are marine birds that have a morphology adapted to aquatic life. Their streamlined and aerodynamic body is covered with dense feathers that act as...

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Explain why brisk walking is a good way to improve cardiovascular health.

Explain why brisk walking is a good way to improve cardiovascular health.

Brisk walking is a bit like a moderate workout for your heart. By practicing regularly, you directly strengthen your heart: it becomes able to pump...

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Explain why seahorses so often coil around marine objects.

Explain why seahorses so often coil around marine objects.

Seahorses are fascinating marine creatures in many ways. Their delicate appearance and small size make them fragile and vulnerable beings in the vast ocean. These...

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Explain why a tennis ball bounces higher in hot weather than in cold weather?

Explain why a tennis ball bounces higher in hot weather than in cold weather?

When you heat a tennis ball, the air inside stirs, as the air molecules move faster due to the heat. As a result, they hit...

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Explain why Japanese samurais carried katanas as their main weapon.

Explain why Japanese samurais carried katanas as their main weapon.

In Japan, starting from the Kamakura period (1185-1333), samurai adopted the katana as their main weapon due to the numerous internal conflicts and close skirmishes...

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Explain why the presence of elastane in sports clothing promotes athletes' freedom of movement.

Explain why the presence of elastane in sports clothing promotes athletes' freedom of movement.

Elastane has an exceptional elasticity that can stretch several times its original length without deforming. As it is highly stretchable, this fabric naturally follows the...

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