ENV150 Chapter 3 Questions 092516

ENV150 Chapter 3 Questions 092516 - Chapter 3 The Physical...

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Chapter 3 – The Physical Science of The Environment 3.3 Question 1. You move a book from your desk to a high shelf. Describe the change that occurs in this system in terms of kinetic and potential energy and work. - The act of moving the book from the desk to the shelf is work. As the book sits on the desk, it has potential energy. As soon as you move it from the desk towards the shelf, it has kinetic energy. Question 3. Photons of gamma rays, X-rays, and UV light are damaging to living systems. Why? - The photons contain a ton of energy that can disrupt the bonds within organic molecules. Question 5. Gas atoms in the atmosphere are constantly colliding, but these collisions do not cause nuclear fusion to occur. Why not? What would be required to initiate fusion? - The protons all have a positive charge, which prevents them from initiating nuclear fusion. 3.4 Question 2. Some continental rocks are nearly 4 billion years old, but nowhere is ocean crust older than 200 million years. Why is this so?
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