Dolphins and porpoises are not the same animal. Dolphins have longer beaks, and porpoises have shorter beaks. Dolphins have spade shaped teeth, and porpoises do not.

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This is how a caterpillar turns into a butterfly. First, it hatches from an egg. Then it eats a lot of leaves. When it's big enough, it'll form a cocoon. Changes happen in this cocoon. Finally, when it emerges from the cocoon, it becomes a butterfly.

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Scientists are not sure of all the causes of tornadoes. But tornadoes can happen when a special kind of thunderstorm called a Super Cell appears. Warm air rising in the thunderstorm and different air direction causes the wind to swirl at high speeds. When these spinning winds turn vertical, it becomes what we know as tornadoes.

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The Great Pacific Garbage Patch is nicknamed the 8th continent. Lying between California and Hawaii in the Pacific Ocean, it is three times the size of France and is the world's biggest ocean waste bin. There are 1.8 billion pieces of floating plastic which kill thousands of marine animals. The garbage has continued to grow since it was first found by Charles Moore in 1997.

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The discovery of the Great Pacific Garbage Patch has raised awareness of the problem. Different organizations have formed to help solve the problem. One organization, called 4Ocean, has collected 1,930 tons of ocean plastic to help clean up the ocean.

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Ms. Chung forgot to water one of her plants. It was in a forgotten corner of a room. First, the plant drooped. Then, it turned yellow and brown. Finally, it looked very dry and brittle. Ms. Chung did not have a plant anymore.

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A single bee colony can pollinate 300 million flowers each day. Grains are primarily pollinated by the wind, but fruits, nuts, and vegetables are pollinated by bees. Seventy out of the top 100 crops that humans consume, which supplies up to 90% of the world's nutrition, are pollinated by bees.

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Did you know that the ice caps in Antarctica and parts of Greenland are melting? They are melting because of something called climate change otherwise known as global warming. The earth is becoming warmer.

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Did you know bees need saving? We don't know why, but our honeybees are disappearing. We can help save them by planting bee-friendly flowers, not using pesticides, and buy honey from a local producer.

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Did you know you can categorize a tree based on what it does to help it survive in the winter? There are two types: deciduous and evergreen. When it gets cold, a deciduous tree will lose its leaves and go dormant. An example of this type of tree is the oak tree. On the other hand, an evergreen tree will not lose its leaves. Its leaves will stay green all winter. An example of this is a pine tree.

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