Điền từ:melted, thousands, and ,away, moderate, cold
Islands can form in a lot of different ways. Some islands formed a long time ago. About 20,000 years ago, Earth was very, very (1) _____. Lots of water from the ocean froze into ice, (2) _____ the sea level went down everywhere. Later,Earth became warmer and a lot of the ice (3) _____, and the sea level went up. Places that were valleys and mountains 20,000 years ago became seas and islands. Sometimes, land can move (4) _____ from the mainland to form an island.It takes (5) _____ of years for islands to form in this way.
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