Frequently Asked Questions: This page contains answers to common questions of
students and parents.
- How does a water-bottle rocket work?
- Why does a golf ball have dimples?
- Why does a curve ball curve?
- Why does water expand when it cools?
- What is the volume of the Earth's moon?
- What is a solar flare?
- What do astronomers believe is at the center of the Milky Way?
- Why can't light escape a black hole?
- What is the closest galaxy to the Milky Way?
- What is the area where a total solar eclipse is visible called?
- During a solar eclipse, the small Moon blocks out the large Sun. How is this possible?
- In addition to three new moons, what did the spacecraft Voyager 1 discover orbiting Jupiter?
- What is the name of the rover that explored the surface of Mars in 1997?
- One of the most famous landmarks on Mars is the Olympus Mons. What is Olympus Mons?
- What is the Caloris Basin?
- What is a space rock that survives its entry into the Earth's atmosphere called?
- What planet, covered by thick clouds, is extremely warm because of the greenhouse effect?
- 20 Things You Didn't Know About Crystals
How does a water-bottle rocket work?
Click on the link to find out!
http://www.physicscentral.com/lou/2001/rockets.html
Why does a golf ball have dimples?
Check out the following web page to find out.
http://wings.avkids.com/Book/Sports/instructor/golf-01.html
Why does a curve ball curve?
http://library.thinkquest.org/11902/physics/curve2.html
Why does water expand when it cools?
Use the following link to find out.
http://how-come.net/2007/12/18/why-does-water-expand-when-it-cools/
What is the volume of the Earth's moon?
The volume of the Earth's moon is the same as the volume of the
Pacific Ocean.
What is a solar flare?
A solar flare is basically a gigantic magnetic arch--like a horseshoe
magnet--that attracts itself inward, back to the surface of the sun.
What do astronomers believe is at the center of the Milky Way?
A black hole.
Why can't light escape a black hole?
Gravitational pull is too strong.
What is the closest galaxy to the Milky Way?
Large Magellanic Cloud
What is the area where a total solar eclipse is visible called?
Umbra
During a solar eclipse, the small Moon blocks out the large Sun. How is this possible?
The Moon is closest to Earth.
In addition to three new moons, what did the spacecraft Voyager 1 discover orbiting Jupiter?
Rings.
What is the name of the rover that explored the surface of Mars in 1997?
Answer #13 (blank)
One of the most famous landmarks on Mars is the Olympus Mons. What is Olympus Mons?
Answer #14 (blank)
What is the Caloris Basin?
Answer #15 (blank)
What is a space rock that survives its entry into the Earth's atmosphere called?
Answer #16 (blank)
What planet, covered by thick clouds, is extremely warm because of the greenhouse effect?
Answer #17 (blank)
20 Things You Didn't Know About Crystals
1 It’s all about the rhythm: Crystals are repeating, three-dimensional arrangements of atoms, ions, or molecules.
2 Almost any solid material can crystallize—even DNA. Chemists from New York University, Purdue University, and the Argonne National Laboratory recently created DNA crystals large enough to see with the naked eye. The work could have applications in nanoelectronics and drug development.
3 One thing that is not a crystal: leaded “crystal” glass, like the vases that so many newlyweds dread. (Glass consists of atoms or molecules all in a jumble, not in the well-patterned order that defines a crystal.)
4 The oldest known pieces of our planet’s surface are 4.4-billion-year-old zircon crystals from the Jack Hills of western Australia.
5 The center of the earth was once thought to be a single, 1,500-mile-wide iron crystal. Seismic studies now show that the inner core is not a single solid but perhaps an aggregate of smaller crystals.
6 Tiny silicate crystals, which need high temperatures to form, have been found inside icy comets from the solar system’s distant, chilly edges. Powerful flares from the sun may have provided the necessary heat.
7 In Chihuahua,
Mexico, a limestone cavern 1,000 feet below the surface contains the largest crystals in the world: glittering gypsum formations up to 6 feet in diameter and 36 feet long, weighing as much as 55 tons.
8 You may be sitting in a gypsum cave right now: It is a primary component of drywall.
9 Are the streets of New York paved with gold? No, but the bedrock schist beneath them is studded with opal, beryl, chrysoberyl, garnet, and three kinds of tourmaline.
10 In 1885 a garnet weighing nearly 10 pounds was discovered beneath 35th Street near Broadway, close to today’s Macy’s store. According to urban lore, it was unearthed either during subway construction or by a laborer digging a sewer.
11 Cheaper by the pound: The so-called Subway Garnet was sold within a day, reportedly for $100—just $2,300 in today’s dollars.
12 The unit of measure for gemstones had humble beginnings. “Carat” comes from the Greek keration, or “carob bean,” which was used as a standard for weighing small quantities. It is equivalent to 200 milligrams, or about 0.007 ounce.
13 When Richard Burton bought Elizabeth Taylor the heart-shaped Taj-Mahal diamond, he is said to have bragged, “It has so many carats, it’s almost a turnip.”
14 A “fancy intense pink” diamond recently set a world record when it was purchased at auction for $46 million by a London jeweler.
15 The Cullinan diamond is the largest known gem diamond—or, actually, was. It weighed 3,106 carats, or nearly a pound and a half, when it was discovered in South Africa in 1905, but it has since been cut into more than 100 stones.
16 The Cullinan stones, all flawless, are now part of the British Regalia. The largest, a 530-carat behemoth, is set in one of the British royal scepters.
17 For the rest of us, there is crystallized sodium chloride, otherwise known as salt. We are literally awash in it: If the water were evaporated from the world’s oceans, we’d be left with 4.5 million cubic miles of salt, equivalent to a cube measuring 165 miles on each side.
18 Another crystal for commoners: sugar. Each American eats an average of more than 130 pounds of it per year.
19 As if sugar’s ties to obesity and tooth decay weren’t enough, new research out of Imperial College London suggests that it contributes to high blood pressure, too.
20 Snow is near-pure crystallized water, but when it collects on the ground it acts as a reservoir for atmospheric pollutants such as mercury and soot. So you probably shouldn’t eat the white snow either.