Why is the sun hot?
The sun is a burning ball of gases. We feel its heat, even though it's 93 million miles away. Hot stuff!
The sun's heat brings changes in the weather.
Why can't I look at the sun?
The sun is much too bright for our delicate eyes and could cause blindness. It's rude to stare - and in this case, it's very dangerous.
Why does it feel cold when a cloud covers the sun?
Clouds soak up most of the sun's warm rays, just like a sponge soaks up water. The air near the ground soon cools - and this can spoil your fun in the sun.
Why do rainbows appear?
Rainbows appear when the sun's behind you and there's rain ahead because sunlight splits into colors as it passes through water droplets.
Why are rainbows full of color?
White sunlight is a perfect blend of seven colors: red, orange, yellow, green, blue, indigo, and violet. So these are the colors that appear when a ray of sunlight passes through a raindrop and splits up.
Why is this rainbow white?
In the cold white Arctic, the sun creates the most amazing sights. This icebow forms when sunlight passes through falling ice crystals. These keep the sun's white rays together.
Why does it rain?
Clouds hold the answer. They carry tiny water droplets that bump into each other, growing bigger and heavier, until they fall, sprinkling or pouring, as rain.
Why do clouds appear?
When warm air rises to meet cold air, moisture in the warm air condenses to make water droplets.
These tiny droplets reflect sunlight, and a fluffy cloud appears.
Why are rain clouds so dark?
Rain clouds appear dark because of the amount of water droplets inside them. The more droplets, the darker the cloud - and the harder it's going to rain!
Why does lightning strike?
A lightning bolt is a giant spark of electricity. It strikes because it is attracted to the ground in the same way that a magnet attracts certain metals.
Why is thunder so noisy?
The loud crashes of a heavy thunderstorm happen because scorching hot lightning makes air expand too fast. That makes a big boom.
Why does thunder follow lightning?
Flash! Silence. Kaboom! Thunder and lightning occur at the same time, but sound travels much slower than light.
Why shouldn't I stand under a tree for cover?
When lightning strikes a tree, the electricity shoots down the trunk. It may electrocute you if you are too close.
Why does the wind blow?
Wind is whistling, invisible air. It blows because air never stops moving - warm air always rises, and cold air rushes in to take its place.
It's like a game of tag that never stops. It just gets faster or slower.
Why do kites fly?
Kites are made to fly "'up, up, and away on windy days. The stretched material is caught by the wind and pulled up. Hold the string tight!
Why do tornadoes appear?
Tornadoes spiral up when a funnel of hot, damp air meets cold, dry air. They are dangerous whirlwinds, and they suck up everything in their path.
Why does it snow?
Clouds can get so cold their water droplets freeze into tiny ice crystals. The crystals cling to each other as they fall from the sky, turning into soft snowflakes.
Why is a snowflake star shaped?
It isn't! It's made up of about 50 tiny crystals that are. Each crystal has six sides, and no two are the same. You can only see the crystals through a microscope.
Why does a snowman take so long to melt?
Snow reflects the sun's heat and light away, and when it is squashed tightly together, as in
a snowman's body, it can even refreeze when temperatures drop overnight!
Why is ice slippery?
When skating across ice, your weight melts
the top layer, creating a slippery surface
between your skates and the ice.
Why do leaves get frosty?
Water in the air can freeze on a cold, solid surface such as a leaf or window. It is known as hoar frost.
Why do icicles appear?
Spikes of ice slowly grow when drops of water freeze before. they can drip to the ground.
Why are icebergs so big?
An iceberg is a broken-off piece of glacier that floats in the sea. The floating crystal castle you see is just the tip of the iceberg. The rest of it is hidden under the water.
Why do dewdrops appear overnight?
As air cools at night, the moisture it contains condenses into droplets. By morning, these droplets are clinging to all sorts of things, from spiders' webs to insects wings.
Why do we have mist?
Just like dew, mist appears when water in the air condenses into droplets. This makes a cloud appear - but it appears at ground
level, so you can walk through it!
Why is fog thick?
Fog is thicker than mist because it contains many more water droplets. In cities these can pick up dirt from cars and smoke.
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