What would happen if all of Earth’s ice melted? As Earth gets    1    (hot) every year, the planet’s ice suffers. The ice is melting faster than ever. Sea ice is    2    (main) in the Arctic. This kind of ice is made of salty seawater. Land ice is mostly in Greenland and Antarctica,     3    is made of fresh water. Sea levels will rise to 50 to 85 meters,     4    (cause) many global changes.     5    (city) near the sea will disappear. Sea animals will have no homes. Earth will move around more slowly. We will have longer days because two milliseconds    6    (add) to each day. Global temperature will rise by 3.5℃. Poisonous chemicals from some ice will go into rivers and oceans.

Only 30 percent of water on Earth is fresh,     7    about 70 percent of that is     8    (freeze). That’s 30 million cubic km of ice. Using this kind of ice     9    (build) a 1000- meter-thick wall,     10    would cover North America.