Answer the following question given this paragraph: Normal light microscopes can magnify objects up to about 1,500 times. Electron microscopes can magnify objects up to 1,000,000 times. Why can electron microscopes magnify images so much? A microscope's resolution depends on the wavelength of light used. The smaller the wavelength, the more a microscope can magnify. Light is a wave, and, as such, it has a wavelength associated with it. The wavelength of visible light, which is detected by the eyes, varies from about 700 nm to about 400 nm. One of the startling conclusions about modern science is that electrons also act as waves. However, the wavelength of electrons is much, much shorterabout 0.5 to 1 nm. This allows electron microscopes to magnify 600700 times more than light microscopes. This allows us to see even smaller features in a world that is invisible to the naked eye. Atoms act the way they do because of their structure. We already know that atoms are composed of protons, neutrons, and electrons. Protons and neutrons are located in the nucleus, and electrons orbit around the nucleus. But we need to know the structural details to understand why atoms react the way they do. Virtually everything we know about atoms ultimately comes from light. Before we can understand the composition of atoms (especially electrons), we need to understand the properties of light. Q: While normal light microscopes can magnify objects up to about 1,500 times, what advanced instruments can magnify objects up to 1,000,000 times? Choices: - magnetic microscopes - micro microscopes - electric microscopes - electron microscopes A:
electron microscopes
(Question)
Answer the following question given this paragraph: Underground mining is used to recover ores that are deeper into Earth's surface. Miners blast and tunnel into rock to gain access to the ores. An underground ore deposit can be approached from above, below, or sideways. The direction depends on the placement of the ore body, its depth, the concentration of ore, and the strength of the surrounding rock. An example of an underground mine can be seen below ( Figure below ). Q: What type of mining is used to recover ores that are deeper into earth's surface? Choices: - deep mining - explosive mining - underwater mining - underground A:
(Answer)
underground
Ques: Answer the following question given this paragraph: In the picture above, a thermal pack is applied to the back. Small packs can be used either for heating or cooling, depending on the material used. A heat pack contains a supersaturated solution of material such as sodium acetate. The solution is clear until a small metal trigger is activated. The sodium acetate then crystallizes out of solution and generates heat in the process. Q: Where can you find sodium acetate? Choices: - table salt - baking soda - a cold pack - a heat pack A:
Ans: a heat pack
(Q).
Answer the following question given this paragraph: Flammability is the ability of matter to burn. Wood is flammable; iron is not. When wood burns, it changes to ashes, carbon dioxide, water vapor, and other gases. After burning, it is no longer wood. Q: The ability of matter to burn is called? Choices: - solubility - eccentricity - unpredictability - flammability A:
(A).
flammability
Ques:Answer the following question given this paragraph: Like the other outer planets, Neptune has rings of ice and dust. These rings are much thinner and fainter than Saturn's. Neptune's rings may be unstable. They may change or disappear in a relatively short time. Q: Like the other outer planets, neptune has rings of ice and what? Choices: - gas - mercury - glass - dust A:

Ans:dust
Answer the following question given this paragraph: You have learned that an allele is an alternative form of a gene. Most, if not all genes have alternative forms causing the resulting protein to function slightly differently. But are there alleles that cause proteins to function dramatically differently or not function at all? A mutation is a change in the DNA or RNA sequence, and many mutations result in new alleles. Some mutations have no effect on the protein, whereas others are either beneficial or harmful. In fact, evolution could not take place without the genetic variation that results from beneficial mutations. In humans, harmful mutations can result in genetic diseases. There are also chromosomal mutations, large changes with dramatic effects. See Mutations are changes in genetic information at http://www. dnaftb. org/27/animation. html for a description of the early work on mutations. Q: An allele is an alternative form of what structure? Choices: - amino acid - enzyme - protein - gene A:
gene