crust). The lower mantle runs slowly‚ at a rate of a few centimeters per year. 3. Core: The Earth has an iron-nickel core that is about 2‚100 miles in radius. At the core-mantle boundary‚ composition changes. Seismic waves suggest this material is of a very high density (10-13 g/cm3)‚ which can only correspond to a configuration of metals rather than rock. The presence of a magnetic field around the earth also indicates a molten metallic core. Unlike the crust and the mantle‚ we don’t have any samples
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If you have closely observed what is happening to the Earth over the past decade and a half‚ week in and week out‚ you may take a dark view of the future. People are not looking after the environment. The Earth is under threat as it has never been before. From the activities of a world population which doubled from three to six billion in four short decades and will probably increase by three billion more. These activities are now wiping out ecosystems and species across the world. • The
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Earth’s surface? Tides on Earth’s surface are caused by the moon’s gravitational pull as well as the Sun’s gravitational pull. However‚ the Sun’s gravity is much weaker on Earth’s surface than the moon’s gravity since the Moon is much closer to Earth than the Sun. 8. Describe one factor that affects the height of the tides in a particular area. One factor that affects the heights of tides in a particular area is because of the nature of the sea floor‚ and how deep or shallow the
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We have inherited much from planet Earth‚ such as natural resources and every single one of the living creatures that planet earth is home to. However‚ in the preceding decades much has happened to our environments. After years of burning unlimited amount of fossil fuels and releasing harmful gases into the atmosphere‚ we have reached a point where it has affected our ecosystem. As result of the changes in our ecosystem‚ we have placed extreme amount of stress on living organisms. Animal population
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This development brings a lot of changes in our life ‚ making our life easier than the past . But this development also brings negative effects to our life . One of the greatest effect that we face now is global warming . Global warming is when the earth heats up (the temperature rises). It happens when greenhouse gases (carbon dioxide‚ water vapor‚ nitrous oxide‚ and methane) trap heat and light from the sun in the earth’s atmosphere‚ which increases the temperature. This hurts many people‚ animals
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The Earth Is Our Home Our home is our natural connection to the Earth. However‚ our modern lifestyle often disconnects us from Earth’s natural elements. Many of us live in a world made of concrete—buildings‚ paved roads‚ parking lots and sidewalks—with minimal exposure to simple plants‚ flowers and trees. We rarely get to experience nature on a large scale- Earth’s beautiful‚ cascading mountains‚ vast forests or powerful waterways. Adding to our dilemma is the high level of pollution and chemicals
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Measuring Earth with a Stick Have you ever heard of the Greek mathematician and astronomer Eratosthenes? His name is probably best known among astronomers. Why do they think so highly of him? Eratosthenes was born about 276 B.C.E. and received some of his education in Athens‚ Greece. He spent a good part of his life‚ however‚ in Alexandria‚ Egypt‚ which at that time was under Greek rule. In about 200 B.C.E.‚ Eratosthenes set out to determine the dimensions of the earth by using a simple stick
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Is Earth really being Harmed by Human Activity? In my opinion‚ the Earth is definitely being harmed or should I say damaged by human activity. It is quite obvious when we look around us‚ when we see read and watch the news‚ and when we research for ourselves. I believe the major cause in the damage of the Earth all began with the introduction of industrialization. As a result of industrialization‚ pollution came about. Deforestation was inevitable because of the expansion of urban developments
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galaxy. He collided with another comet near a black hole. The explosion was so the black hole exploded and made many planets. The planets were scattered throughout the galaxy. Then the being that was inside named Atlas came out and headed towards earth since he was near the planets. Atlas then started pulling things out a small bag that he contained around his waist. He pulled out things that looked like little mountains. Atlas then threw the mini mountains to the floor and Poof Mountains
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Plants and Life on Earth What is the environment? The environment is everything that lives on Earth plus the air‚ sun‚ water‚ weather‚ and the Earth itself. Sing a Song about the Role of Plants! Teachers—download lesson plans to use in your classroom! Plants help the environment (and us!) in many different ways: Plants make food Plants are the only organisms that can convert light energy from the sun into food. And plants produce ALL of the food that animals‚ including people‚ eat.
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