*Question*
Answer the following question given this paragraph: Continental crust is much thicker than oceanic crust. It is 35 kilometers (22 miles) thick on average, but it varies a lot. Continental crust is made up of many different rocks. All three major rock types igneous, metamorphic, and sedimentary are found in the crust. On average, continental crust is much less dense (2.7 g/cm3) than oceanic crust. Since it is less dense, it rises higher above the mantle than oceanic crust. Q: How thick is the earth's continental crust, on average? Choices: - 60 kilometers - 15 kilometers - 25 kilometers - 35 kilometers A:
**Answer**
35 kilometers

*Question*
Answer the following question given this paragraph: Mutations have many possible causes. Some mutations occur when a mistake is made during DNA replication or transcription. Other mutations occur because of environmental factors. Anything in the environment that causes a mutation is known as a mutagen . Examples of mutagens are shown in Figure below . They include ultraviolet rays in sunlight, chemicals in cigarette smoke, and certain viruses and bacteria. Q: What is it called when a mistake occurs in dna replication. Choices: - adaptation - degradation - radiation - mutation A:
**Answer**
mutation

*Question*
Answer the following question given this paragraph: Objects in motion that return to the same position after a fixed period of time are said to be in harmonic motion. Objects in harmonic motion have the ability to transfer some of their energy over large distances. They do so by creating waves in a medium. Imagine pushing up and down on the surface of a bathtub filled with water. Water acts as the medium that carries energy from your hand to the edges of the bathtub. Waves transfer energy over a distance without direct contact of the initial source. In this sense waves are phenomena not objects. Q: Objects in motion that return to the same position after a fixed period of time are said to be in what type of motion? Choices: - circular - curving - dynamic - harmonic A:
**Answer**
harmonic

*Question*
Answer the following question given this paragraph: Before leaves fall from trees in autumn, they have potential energy. Why do they have the potential to fall?. Q: What type of energy is possessed by autumn leaves before they fall? Choices: - mechanical energy - kinetic energy - radioactive energy - potential energy A:
**Answer**
potential energy