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Stratus clouds – A blanket of cloud – Weather science

By |2017-08-20T18:32:08+00:00August 20th, 2017|Physics|

Stratus clouds (thanks to NASA) If you see stratus clouds, that's the time to get inside and stay there. Stratus clouds mean rain if it is warm and snow if it is cold. They look like a huge gray blanket that hangs low in the sky. Sometimes stratus clouds are on the ground or very near the ground, [...]

What is snow? Weather – Earth science

By |2018-04-24T14:32:37+00:00August 20th, 2017|Physics|

If it's colder, rain may fall as snow. About two and a half billion years ago, the Earth finally cooled down enough for it to snow for the first time. Most of the time since then, the Earth has been warm enough that it didn't snow at all. But from time to time, the Earth becomes cooler, entering [...]

Why does it rain? Weather – Earth science

By |2017-08-20T18:07:53+00:00August 20th, 2017|Physics|

Thanks to Rocbike for the great picture! When the Earth first formed, about 4.5 billion years ago, it didn't rain here. Until about four billion years ago, Earth was too hot for raindrops to form, and water just hung in the air as steam without falling as rain. Then as the Earth's surface began to cool, in the Archaean era, huge clouds formed and began [...]

Nimbus clouds – Rain clouds – Weather

By |2018-11-09T06:53:08+00:00August 20th, 2017|Physics|

Cumulonimbus clouds are a type of nimbus cloud What is a nimbus cloud? Nimbus clouds often mean that a thunder storm is brewing: there may soon be thunder and lightning. Get out of the swimming pool! What causes thunderstorms? Other kinds of clouds More about weather Nimbus is a fancy word, but it really just means [...]

Rain project – Weather science

By |2018-05-31T11:49:18+00:00August 20th, 2017|Physics|

People driving cars in the rain Some of the tiny particles inside the clouds - the cloud seeds - are made of pollution from cars and factories. They're little particles of carbon from burning gas, or other pollutants. Because people drive more on weekdays than on weekends, there is more and more pollution [...]

Steam clouds projects – Weather science

By |2018-05-31T11:49:31+00:00August 20th, 2017|Physics|

See the steam coming out of this kettle? You can make your own clouds and see how they work. Just take a tea kettle and fill it full of water and put it on the stove to boil (make sure this is okay with your folks). When the steam comes out, it makes a white cloud - that's the [...]

Indra, god of rain – Ancient India

By |2017-07-21T09:16:14+00:00July 21st, 2017|India, Religion|

Indra, 4-5th c. AD (Mathura, India) In the earliest Hindu stories that we know of, from the Rig Veda, Indra is the ruler of the Hindu gods, the way Zeus is the ruler of the Greek gods, or Thor the ruler of the German gods. These stories probably go back at least to about 1000 BC. In the Rig Veda, Indra [...]

Persephone and Hades – Greek religion

By |2018-04-23T09:49:50+00:00July 16th, 2017|History|

Hades kidnaps Persephone (mosaic from Amphipolis, 300s BC) Persephone was the daughter of the goddess Demeter. One day Persephone was dancing with her friends in a sunny meadow, having a good time, picking flowers. Suddenly Persephone's spooky uncle Hades burst out of the ground and grabbed her and pulled her into his chariot! He took Persephone (purr-SEFF-oh-nee) [...]

What is water made of? Molecules and chemistry

By |2017-06-02T18:02:44+00:00June 2nd, 2017|Chemistry|

A big ocean wave The first molecules of water formed out in space, about 14 billion years ago, as part of the nebula left over after an early star exploded in a supernova. There were a lot of hydrogen and oxygen atoms floating around in these nebulae, and when they stuck together that [...]