... diverse ecosystems could be conserved and protected for the future. He did so by creating an unprecedented number of national parks, reserves, monuments, and wildlife reserves. Roosevelt also developed a conservation policy that included the interests of the environment as well as the interests of industry. Roosevelt's determination to see positive change was also adopted by the American people. During this time ... Laws such as the Pure Food and Drug Act and Agricultural Appropriation Act of 1906 would give the government the needed power to protect the growing number of consumers in th...

• Word Count: 917
• Approx Pages: 4
• Grade Level: Undergraduate

... idea that charged particles (electrons and protons) interact by emitting and absorbing photons, the particles of light that transmit electromagnetic forces. These photons are virtual; that is, they cannot be seen or detected in any way because their existence violates the conservation of energy and momentum. The particle exchange is merely the "force" of the interaction, because the interacting particles change their speed and direction ... of travel as they release or absorb the energy of a photon. Photons also can be emitted in a free state, in which case they may be observed ... ...

• Word Count: 621
• Approx Pages: 2
• Grade Level: Undergraduate