Science news.Science News
DIRECTIONS: Read the Science News section on pages 4 to 7. Then, test your knowledge by filling in the letters of the correct answers below.
1. How do hippos in the wild try to keep their teeth and gums healthy?
(A) They rinse their mouths with water after they eat.
(B) They use their canine teeth to strip bark from trees.
(C) They don't make an effort. Wild hippos are the only mammals known not to develop cavities.
(D) They eat lots of mint, which is high in antioxidants Antioxidants
Substances that reduce the damage of the highly reactive free radicals that are the byproducts of the cells.
Mentioned in: Aging, Nutritional Supplements
n. and can help freshen fresh·en
v. fresh·ened, fresh·en·ing, fresh·ens
1. To become fresh, as in vigor or appearance: freshened up after the day's work.
2. hippo breath.
2. Pluto resides in a region of space called the
(A) Kuiper belt Kuiper belt: see comet; Kuiper, Gerard Peter.
or Edgeworth-Kuiper belt
Disk-shaped belt of billions of small icy bodies orbiting the Sun beyond the orbit of Neptune, mostly at distances 30–50 times Earth's distance
(B) asteroid belt
(C) Oort cloud Oort cloud: see comet.
Vast spherical cloud of small, icy bodies orbiting the Sun at distances ranging from about 0.3 light-year to one light-year or more that is probably the source of most long-period comets. solar nebula solar nebula
Gaseous cloud from which, in the nebular hypothesis of the origin of the solar system, the Sun and planets formed by condensation. In 1755 Immanuel Kant suggested that a nebula gradually pulled together by its own gravity developed into the Sun and planets.
3. Which of the following is NOT a criterion that a celestial body has to meet to qualify as a planet?
(A) It must orbit the sun.
(B) It must have enough mass to be shaped into a sphere.
(C)Its path must be clear of other celestial bodies.
(D) It must be larger than Mercury, the smallest planet in the solar system solar system, the sun and the surrounding planets, natural satellites, dwarf planets, asteroids, meteoroids, and comets that are bound by its gravity. The sun is by far the most massive part of the solar system, containing almost 99.9% of the system's total mass. .
4. A recent study shows that the passengers in a car's center backseat were -- percent more likely to survive a crash than side backseat riders.
5. During a car crash, the "crush zone" absorbs some of the car's
(A) kinetic energy kinetic energy: see energy.
Form of energy that an object has by reason of its motion. The kind of motion may be translation (motion along a path from one place to another), rotation about an axis, vibration, or any combination of
(C) potential energy.
6. Iron turns into rust when it
(A) reacts with oxygen.
(B) loses a proton.
(C) bonds with an atom of carbon. is exposed to extreme heat.
7. The U.S. Census Bureau predicts that the U.S. population will top -in October 2006.
(A) 100 million
(B) 300 million
(C) 500 million
(D) 1 billion
8. The U.S. population is growing at a rate of approximately one person every
(B) 10 seconds.
(C) 2 minutes.
9. A fuel cell helps generate electricity by stripping a(n) from each atom of hydrogen that enters the cell.
10. What is the only waste that a fuel cell emits?
(B) carbon dioxide carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure.
NEWS QUIZ, TE 4