Calcium carbonate in shells.
In general, they are on the edges of continents, where you find mountain ranges, regular earthquakes and active volcanoes - Eg: South America and Asia.
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birth rate means the number of births per 100 people
death rate means the number of deaths per 100 people
When a country has more death rates , it is less populated
when a country has more birth rates it is more populated
Russia is sparsely populated because is has less birth rates and more death rates
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i think D but am not so sure
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However, Venus and Earth are also very different. Venus has an atmosphere that is about 100 times thicker than Earth's and has surface temperatures that are extremely hot. Venus does not have life or water oceans like Earth does. Venus also rotates backwards compared to Earth and the other planets.
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