CONTENTS WAT C H O U T I C E B E R G W H AT I S T E M P E R AT U R E T I N Y ATO M S MOVING MOLECULES ENERGY SOURCE C H A N G I N G S TAT E S GETTING COLD HOW GLACIERS FORM MOVING GLACIERS H E AT I N G E A R T H M E LT I N G G L A C I E R S CHANGING ICE FREEZING POINT GLOSSARY WEBSITES INDEX 4 6 8 10 12 14 16 18 20 22 24 26 28 30 31 32
O I NWATCH OUT ICEBERG T C U D O R T N I Loud groans and moans echo through the water Something is happening deep inside the glacier Suddenly a massive piece of ice breaks off It falls into the sea with a huge splash It drifts away from its frozen home This floating ice is a new iceberg 4
Most glaciers look like solid walls rising from the sea Some have been around for thousands of years Cold temperatures keep glaciers solid But heat is a glacier’s enemy Rising temperatures can break glaciers apart In cold temperatures the water molecules slow down They bond together to form a solid mass of ice But as temperatures rise the molecules start to move around more They break their bonds The warm water under a glacier heats it up Melted water on its top also thins the glacier This can cause a glacier to crack If the crack is big enough an iceberg is born
