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Level C

Vol. 24, No. 3 DID YOU KNOW??

Global Warming

Sea ice is like a refrigerator. It keeps the nor thern oceans cold.

Land ice is fresh water ice found in glaciers. Glaciers (gla-ciers) are frozen rivers of fresh water ice. Sea ice is made from frozen seawater. Sea ice is found in the Arctic Circle and the Antarctic continent (Ant-arc-tic con-ti-nent) called Antarctica (Ant-arc-ti-ca). A continent is a large body of land. The Arctic Circle is an invisible (in-vis-i-ble) circle at the top of the world. It is made up of sea ice, seawater, and some land! The North Pole lies in the Arctic Circle. The South Pole is located in Antarctica. Antarctica is covered in land ice and snow. North Pole

glacier

Global Warming

NOW?? DID YOU K ldest,

is the co Antarctica and driest windiest on Earth. continent

South Pole

Antarctic continent (Antarctica)

Meteorologists (me-te-o-rol-o-gists) are scientists who study the weather. For many years, Earth’s temperature (tem-per-a-ture) has been getting warmer. The sun’s heat can be trapped in Earth’s atmosphere (at-mo-sphere). The atmosphere acts like a big blanket of mixed gases. It traps heat that causes global (glo-bal), or worldwide, warming. More ice is melting. Summers and winters may get warmer. Earth may be heating up too fast. Why do you think global warming is important? C-1


Vocabulary

I C E B E R _________ S

Fill in the missing letters to complete the hidden word.

What is global warming melting?

M E _________ T I N G W E _________ T H E R

A N T A R _________ T I C C O N T _________ N E N T H _________ A T The hidden word is:

What does this word mean?

E N E _________ G Y _________ N O W Adult Supervision Recommended

Weekly Lab Science says… Make a Blubber Mitten – Scientists study animals Blubber helps keep in the Arctic Circle and Antarctica. Many animals have animals warm in cold blubber (blub-ber). Blubber is a thick layer of fat. temperatures. You need: shortening, 2 zip-close plastic quart-size bags, bowl of ice water with ice cubes, thermometer, thermometer spoon, clock or watch, paper or notebook, pencil

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Step 1: Place the thermometer in the ice water bowl. Measure the temperature. notebook ice water Write the temperature down. pencil ice Step 2: Use a spoon to half-fill one plastic shortening bag with shortening. Zip the bag closed. Step 3: Place your hand in a second plastic bag. Step 4: Open the shortening bag. Place your bagged hand inside the shortening-filled bag. Mold zip-close the shortening “mitten” around your hand. bags Step 5: Place your free hand and the shortening “mitten” hand in the ice water. Try to keep both hands in for 20 seconds. Which hand is cold? shortening “blubber” How cold does your hand feel inside the mitten “blubber” mitten? What does the blubber do? watch

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SCIENCE WEEKLY, Level C (ISSN 8756-1778), September 21, 2007 is published monthly in August, November, December, February, April and May; and, twice-monthly in September, October, January and March. Copyright © 2007 (Level C) CAM Publishing Group., Inc., 2141 Industrial Pkwy., Suite 202, Silver Spring, MD 20904-7824 U.S.A. (301) 680-8804 (800) 4-WEEKLY. Classroom subscription rate: (minimum 20 subscriptions to same address): $4.95 per student, per school year. Individual rate for orders less than 20 subscriptions: $19.95 per student, per year, payable in advance. Periodical postage paid at Silver Spring, Mar yland and additional mailing of fices. Postmaster: Send address changes to Science Weekly, Level C, P.O. Box 70638, Chevy Chase, MD 20813-0638. Visit our web site at www.scienceweekly.com. C-2


Math Scientists measure melting glaciers. In Austria, the Pasterze (Pas-ter-ze) Glacier is 8,000 meters long. For 106 years, it has melted 15 meters each year. One meter equals about 3 feet.* 2002

2003

2004

2005

2006

1. In five years, 2. In 2003, the glacier melted 3. How many feet 4. How many meters how many two times the 15 meters. did the glacier will melt in 10 meters have How many meters did it melt in 2003? years? melted? melt in 2003? meters

meters

feet

meters

* Meter Stick 39.4 inches ( or 1 meter)

Yard Stick 36 inches ( or 3 feet)

Writing in Science In your WEEKLY LAB, you learned about blubber. Which animals have blubber? Which animals have thick fur? What will happen if the air and water temperature becomes warmer? Would blubber help or hurt the animals? Write your ideas below.

DISTINGUISHED ACHIEVEMENT AWARD WINNER

DID YOU KNO W??

The Goldenrod Gall larva freezes un Fly til temperatures warm up. It is a tr ue “bug sicle!”

arctic fox

walruses leopard seal

Published by CAM Publishing Group, Inc., Silver Spring, MD • Publisher / Editor, DR. CLAUDE MAYBERRY, JR. • • Associate Editor, DR. LAURA GEHL • Writer, LISA P. HILL • Artist, LINDA KING • Graphic Design and Production, LINDA KING • • Materials in this issue may not be reproduced in whole or in part in any form without special permission from the publisher.

C-3


Challenge Saving energy and water may help slow down global warming. What can you do to save energy and water? Answer yes or no. Saves Energy? (yes or no)

1. Eat more pizza. 2. Turn off water while brushing your teeth. 3. Ride your bike to the library. 4. Recycle plastic bags. 5. Hop on one foot. 6. Turn off lights. 7. Take short showers. 8. Plant trees at home and in parks.

Where in the World? Look at the world map. Where are the glaciers located? Write down the glacier names and locations.

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Pasterze Glacier – Austria Sheldon Glacier – Antarctica Grímsvötn Glacier – Iceland Kolka Glacier – Republic of Georgia/Russia

Glacier Name

Location

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DID YOU KNOW??

seawater. Sea ice is frozen m melting fro e m Icebergs co are huge s glaciers. Iceberg water. n ze fro of chunks

1. 2.

DID YOU KNOW??

Polar bears and se als live on sea ice. Without sea ice, polar bears and se als will not have a home.

3. 4. “How do birds fly?” “Maybe they fly the same way airplanes fly.” “You will find out in our next issue!” C-4


Science Weekly Global Warming Level C