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thach2k1
2 năm trước
cho 11,1g hỗn hợp ba kim loại Na, Ca và kim loại M( hóa trị 2) có tỉ lệ mol tương ứng là 1:1:2 tác dụng với oxi dư thu được 16,7g hỗn hợp 3 oxit.Kim loại M là ?
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Giup mk vs mk cảm ơn Read the passage and choose the best answer to each question. Volcanoes have been erupting on the earth for millions of years. More than five hundred of them still erupt today. These are called active volcanoes. Volcanoes are located in belts or chains. They are found where the earth’s crust is weak. The weak spots let the hot rock escape when the volcano erupts. Many volcano belts are mountain ranges along the edges of continents. One belt runs along the western coast of South America up through the western part of the United States. Other volcanoes are found in ocean basins. About three-fifths of all active volcanoes in the world are in the Pacific Ocean. Many of these volcanoes erupt under the water. The Hawaiian Islands were built by volcanoes that began erupting under water and finally reached the surface of the ocean. 1. The passage says that about five hundred volcanoes_____. A. will erupt this year B. are still active C. are located under water D. have been discovered 2. Most of the active volcanoes are located in_____. A. the Pacific Ocean B. South America C. the Atlantic Ocean D. the western United States 3. Which of the following is NOT true? A. Volcanoes are found in belts or chains. B. The earth’s crust is weak along mountain ranges. C. Hot rock escapes during volcano eruption. D. Volcanoes can be found in the ocean basins. 4. The Hawaiian Islands were built by volcanoes that_____. A. began erupting under water B. formed a mountain range under water C. finally reached the surface of the ocean D. both A and C 5. The best title for this selection may be_____. A. How the Hawaiian Islands Were Built B. At the Bottom of the Ocean C. The Earth’s Volcanoes D. Why Volcanoes Erupt

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