How do things glow in the dark?

How do things glow in the dark?

Phosphors radiate visible light after being energized. This means you have to expose the items to light for a while before they will glow in the dark. Phosphors then slowly release their stored energy over time. As they release the energy, they emit small amounts of light, which we see as an object glowing.

How many dogs years are in 1 human year?

But the conventional wisdom that one dog year equals seven human years is an oversimplified view of how old your dog is in human years. Although a dog’s age averages out this way, there is quite a bit of variation. For example, dogs mature more quickly than children in the first couple of years.

Why do lakes freeze from the top down rather than the bottom up?

The reason why ice forms on the top of lakes and ponds is that once water cools below 39 degrees Fahrenheit, it becomes lighter and less dense the more it cools. This means that water expands as it freezes into ice. As a result, ice takes up more room than the water it was made from.

Why are icebergs made of fresh water?

True icebergs are galcier fragments that have fallen into the sea. Glaciers are made of compacted smow, which is fresh water. Additionally, “sea ice” that forms from the freezing of sea water is also basically fresh water as well. This is because when saltwater freezes, it excludes salt from the ice crystal lattice.

How many division 1 basketball teams are there?

A map of all NCAA Division I basketball teams. In 2013–14, there are 351 schools in 32 Division I basketball conferences. The conferences for 2013–14 are: America East Conference.

What does the phrase 10 fold mean?

ten·fold/ˈtenˌfōld/ Adjective: Ten times as great or as numerous: “a tenfold increase in the use of insecticides”. Adverb: By ten times; to ten times the number or amount.

How many timeouts do you get in college basketball?

In games which are broadcast on television, radio, or over the Internet, each team is granted one 60-second timeout and four 30-second timeouts per game in addition to the media timeouts each half. High school basketball allots five time outs per game, with three 60-second and two 30-second time outs.

Why is Aberdeen called the Granite City?

Aberdeen is well known as a Granite City. Many of the buildings in Aberdeen are made out of granite. Granite is a hard rock that is often used as a building material. There was once a huge granite quarry in Aberdeen called Rubislaw Quarry.