Answer the following question given this paragraph: By 180 million years ago, Pangaea began to break up. The continents started to drift apart. They slowly moved to where they are today. The movement of the continents caused Panthalassa to break into smaller oceans. These oceans are now known as the Pacific, Atlantic, Indian, and Arctic Oceans. The waters of all the oceans are connected. That's why some people refer to the oceans together as the "World Ocean. ". Q: By 180 million years ago, pangaea began to do what? Choices: - combine - freeze - grow - break up A:
break up
Answer the following question given this paragraph: Mechanical energy is the energy of an object that is moving or has the potential to move. It is the sum of an object's kinetic and potential energy. In Figure below , the basketball has mechanical energy because it is moving. The arrow in the same figure has mechanical energy because it has the potential to move due to the elasticity of the bow. What are some other examples of mechanical energy?. Q: What term describes the energy of an object that is moving or has the potential to move? Choices: - stationary energy - molecular energy - thermal energy - mechanical energy A:
mechanical energy
Q: Answer the following question given this paragraph: Most cells are so small that you cannot see them without the help of a microscope . It was not until 1665 that English scientist Robert Hooke invented a basic light microscope and observed cells for the first time, by looking at a piece of cork. You may use light microscopes in the classroom. You can use a light microscope to see cells ( Figure below ). But many structures in the cell are too small to see with a light microscope. So, what do you do if you want to see the tiny structures inside of cells?. Q: What would you need to see most cells? Choices: - ultraviolet - infrared - mirror - microscope A:
A: microscope
Question: Answer the following question given this paragraph: Bacteria and viruses can infect the brain or spinal cord. An infection of the brain is called encephalitis. An infection of the membranes that cover the brain and spinal cord is called meningitis. A vaccine is available to prevent meningitis caused by viruses (see Figure below ). Q: An infection of the brain is called? Choices: - tuberculosis - influenza - syphilis - encephalitis A:
Answer: encephalitis
*Question*
Answer the following question given this paragraph: Things Great and Small Nuclear Decay Helps Explain Earth's Hot Interior A puzzle created by radioactive dating of rocks is resolved by radioactive heating of Earth's interior. This intriguing story is another example of how small-scale physics can explain large-scale phenomena. Radioactive dating plays a role in determining the approximate age of the Earth. The oldest rocks on Earth solidified about 3.510 9 years agoa number determined by uranium-238 dating. These rocks could only have solidified once the surface of the Earth had cooled sufficiently. The temperature of the Earth at formation can be estimated based on gravitational potential energy of the assemblage of pieces being converted to thermal energy. Using heat transfer concepts discussed in Thermodynamics it is then possible to calculate how long it would take for the surface to cool to rock9 9 formation temperatures. The result is about 10 years. The first rocks formed have been solid for 3.510 years, so that 9 the age of the Earth is approximately 4.510 years. There is a large body of other types of evidence (both Earth-bound and solar system characteristics are used) that supports this age. The puzzle is that, given its age and initial temperature, the center of the Earth should be much cooler than it is today (see Figure 31.26). Q: What method plays a role in determining the approximate age of the earth and makes use of uranium? Choices: - fuel dating - carbon dating - waste dating - radioactive dating A:
**Answer**
radioactive dating
(Question)
Answer the following question given this paragraph: The electrical conductivity of a substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors. A larger or smaller piece of glass will not change this property. An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. Other intensive properties include color, temperature, density, and solubility. Q: Silver, gold, and copper all conduct what very well? Choices: - light - sound - microwaves - electricity A:
(Answer)
electricity