Freshwater is the kind of water terrestrial plants and animals need to survive. It has less than 1,000 parts per million (ppm) of salt in it. So freshwater does not mean it has no salt but it has a very low level of salt in the water. ...
Normally, the sun’s heat evaporates water, mostly from the ocean, and that water vapor is condensed into clouds. But if clouds are cut out of the Earth’s water cycle, that water just hangs around in the air, ...
Having travelled from the outer reaches of our Solar System, this organic matter ended its journey in the oceans of primitive Earth. Now we need to know what the environmental parameters were which allowed this matter to keep reassembling until it formed living organisms.这些有机物从太阳系的外围...
andoceansaroundthe world.Previousresearch hasfoundthattheyflowoverlongdistancesand intoouroceans,damagingecosystemsalongthe way. 5 Thewastewaterthenflowsintorivers andouttosea,wheretheyareeatenbyseaanimals.Ifpeopletheneattheseanimals,itmeans thatwe?reeatingtheplasticaswell. A.Aretheybadforus? B.andnowit?s...
【人体篇】☆如果你一个月不洗澡会发生什么·What Happens If You Don't Shower for a Month 03:35 【地球篇】☆如果你想在海啸中冲浪会怎么样·What If You Tried to Surf a Tsunami 06:16 【地球篇】☆如果我们抽干海洋·What If We Drained the Oceans 03:39 【人体篇】☆如果你死了会怎么样·What...
OK. As you probably know, salmon are born in fresh water streams, they migrate to oceans where they spend most of their lives, and then they return to the same streams where they were born to reproduce or spawn. In order to spawn, salmon need cold, clear streams to ensure the survival...
What might be the environmental consequences if a significant amount of surfactant were to get into a pond? What is meant by the term water pollution and what are several major processes that contribute to water pollution? Define freshwater. Explain why...
If there were periods of drought, any adaptations allowing the fish to survive the dry conditions would have been advantageous. In these rhipidistians,several such adaptations existed. It is known that they had lungs as well as gills for breathing. Cross sections cut through some of the ...
Healthy oceans play a very important role in a healthy planet. 2 Overfishing (过度捕捞) has had terrible influence on many kinds of fish and other animals. Pollution has caused serious damage (破坏) in many areas. In 1982, one UN sea agreement described the “high seas”—the parts of ...
oceans, as and the atmosphere as well. Second voices should be made to announce the public of the importance of protecting the environment. Third enterprises should pay special attention to the effect they have on the environment and work out solutions for the problems. Only by changing the way...