Why Do the Northern Lights Appear?
The Northern Lights are long, waving streamers of light, often seen in the night sky in the Northern Hemisphere during both warm and cold…
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Light
When Does Sheet Lightning Occur?
Sheet lightning usually occurs during a storm as the result of a discharge of excess electricity within a single thundercloud. The outline is obscured…
When Is Pumice Stone Formed?
Pumice stone is formed when molten volcanic glass, ejected from beneath the earth’s crust, cools so rapidly that there is no time for it…
How Does the Moon Shine?
Even though the Moon is the brightest object in the night sky, it does not make its own light. The moon shines by the light it reflects from
When Was the First Lighthouse Built?
The first known lighthouse was the Pharos of Alexandria in Egypt, a 400-foot tower built about 280 B.C. A wood fire was kept burning on the