Science news.DIRECTIONS: Read the Science News section on pages 4 to 7. Then, test your knowledge by filling in the letter of the correct answer below. 1. Which of the following statements about the Grand Canyon Grand Canyon, great gorge of the Colorado River, one of the natural wonders of the world; c.1 mi (1.6 km) deep, from 4 to 18 mi (6.4–29 km) wide, and 217 mi (349 km) long, NW Ariz. is FALSE? (A) It began to form more than 60 million years ago. (B) It is a deep valley between two mountains Two Mountains was a federal electoral district in Quebec, Canada, that was represented in the Canadian House of Commons from 1867 to 1917. It was created by the British North America Act of 1867. . (C) The Colorado River Colorado River River, south-central Argentina. Its major headstreams, the Grande and Barrancas rivers, flow southward from the Andes Mountains and meet to form the Colorado near the Chilean border. It flows southeastward across northern Patagonia and the southern Pampas. helped carve out the canyon. (D) A long time ago, Earth's crust shifted, lifting the area. 2. Earth's crust is (A) the outermost out·er·most adj. Most distant from the center or inside; outmost. outermost Adjective furthest from the centre or middle Adj. 1. layer of Earth. (B) a deep canyon in the earth. (C) one solid rock plate. (D) the center of Earth. 3. Scientists believe that listening to a portable music player See digital music player and Portable Media Center. at sound levels above --decibels can damage your ears. (A) 22 (B) 48.7 (C) 65 (D) 85 4. To protect against hearing loss, scientists recommend that people who listen to portable music players should listen at levels of percent and below, for a limit of--per day. (A) 85, 2 hours (B) 78, 1.5 hours (C) 75, 2.3 hours (D) 50, 1 hour 5. An extra second will be added to the year 2005 because (A) Earth is spinning faster now than in the past. (B) Earth is spinning slower now than in the past. (C) Earth is tugging on the moon. (D) the moon is traveling faster around Earth. 6. A generator (A) converts one form of energy into another. (B) stores energy in fuel cells. (C) is part of a hamster's exercise wheel. (D) is a computer chip inside a cell phone. 7. In the body, insulin (A) increases the heart rate. (B) breaks down sugars from food. (C) breaks down fat. (D) increases the rate of digestion. 8. Until Exubera is approved, people with diabetes continue to take insulin by (A) swallowing a pill. (B) drinking it. (C) inhaling it into their lungs. (D) injecting it into their bloodstream. 9. A larva larva, in zoology larva, independent, immature animal that undergoes a profound change, or metamorphosis, to assume the typical adult form. Larvae occur in almost all of the animal phyla; because most are tiny or microscopic, they are rarely seen. is a(n) (A) developing worm. (B) young parasite parasite, plant or animal that at some stage of its existence obtains its nourishment from another living organism called the host. Parasites may or may not harm the host, but they never benefit it. . (C) adult insect. (D) worm that eats the insides of crickets. 10. When a hairworm hairworm, worm of the phylum Nematomorpha. injects a chemical into a cricket's brain, it makes the insect (A) jump into water. (B) fly in circles. (C) look for a mate. (D) fall asleep. ANSWERS 1. b 2. a 3. d 4. d 5. b 6. a 7. b 8. d 9. a 10.a |
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