However, the chemical composition of water on comets (hard water) consists of a heavy hydrogen, i.e. a hydrogen atom that contains both a proton and a neutron in its nucleus. This is different from the water currently present in the oceans of Earth, which is essentially a combination of ...
"It is extremely exciting, because it means that the presence of water is a byproduct of the planet formation process," says one researcher.Where did Earth get its abundant water? Was it really delivered by asteroids and comets? New evidence fr...
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百度试题 结果1 题目How (protect)the Earth, We can save water!相关知识点: 试题来源: 解析 protect 该句子是一个疑问句,询问如何保护地球。句子的结构是“疑问词+动词原形+其他”,因此括号中的动词“protect”应该保持原形。 答案:protect反馈 收藏
How much freshwater is in groundwater? How deep is the groundwater table? What approximate percentage of the earth's freshwater is groundwater? How much water is under the Earth's crust? How much water is in the Earth's crust? How deep is an artesian well?
百度试题 结果1 题目—How (protect) the Earth? —We can save water.相关知识点: 试题来源: 解析 to protect 【详解】 句意:—怎样保护地球?—我们可以节约水。本题考查动词的形式,how后加to do sth表示怎样去做,故答案为to protect。反馈 收藏 ...
About 70 percent of our planet’s surface is covered with water, and it plays an important role in our daily lives. But how did water get on Earth in the first place?
It states the condensation of different elements from the cloud at a varying temperature. It also notes the unique mixture of substances that makes up the air, the composition of Earth's crust, and the origin of the water supply.doi:10.1016/S0262-4079(08)62435-5ClarkStuartNew Scientist...
三、根据课文内容,将短文补充完整。How to protect the Earth?Water is useful. We use water to clean things. There's not much water in many places We shouldn't waste water. We should reuse and save it.Most of our energy comes from coal and oil. We use energy to drive cars. There not...
46. Some desert plants grow d___ into the earth to get water. 【答案】(d)eep 【解析】 【详解】句意:一些沙漠植物生长到土壤深处以获取水分。根据“into the earth to get water”可知是指沙漠植物生长到地下深处来获取水。deep“深的”,...