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Multi-word Results
| black hole |
a region or body in space with gravity so strong that neither light nor matter can escape it. Scientists believe that black holes form when very large stars collapse. |
| ozone hole |
an area in the ozone layer where the ozone becomes thin. There is a large ozone hole over Antarctica and a smaller one over the North Pole. Scientists warn us this is dangerous. |
| water hole |
a place in a dry area, such as desert, where water comes up from the ground and where animals come to drink. |
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