Answer the following question given this paragraph: Efforts to reduce future global warming mainly involve energy use. We need to use less energy, for example, by driving more fuel-efficient cars. We also need to switch to energy sources that produce less carbon dioxide, such as solar and wind energy. At the same time, we can increase the amount of carbon dioxide that is removed from air. We can stop destroying forests and plant new ones. Q: Reducing the production of what gas, or removing it from the air, are practices that could reduce global warming? Choices: - helium - hydrogen - oxygen - carbon dioxide A:
carbon dioxide
Answer the following question given this paragraph: Homeostasis is maintaining a constant internal environment. Q: What type of environment is maintained in homeostasis? Choices: - fluid internal - noisy internal - stable external - constant internal A:
constant internal
Q: Answer the following question given this paragraph: Q: Marine fishes take in divalent ions by incessantly drinking what? Choices: - sand - oxygen - algae - seawater A:
A: seawater
Question: Answer the following question given this paragraph: Radiation can be absorbed or shielded by materials, such as the lead aprons dentists drape on us when taking x rays. Lead is a particularly effective shield compared with other materials, such as plastic or air. How does the range of radiation depend on material? Ionizing radiation interacts best with charged particles in a material. Since electrons have small masses, they most readily absorb the energy of the radiation in collisions. The greater the density of a material and, in particular, the greater the density of electrons within a material, the smaller the range of radiation. Collisions Conservation of energy and momentum often results in energy transfer to a less massive object in a collision. This was discussed in detail in Work, Energy, and Energy Resources, for example. Different types of radiation have different ranges when compared at the same energy and in the same material. Alphas have the shortest range, betas penetrate farther, and gammas have the greatest range. This is directly related to charge and speed of the particle or type of radiation. At a given energy, each , , or will produce the same number of ionizations in a material (each ionization requires a certain amount of energy on average). The more readily the particle produces ionization, the more quickly it will lose its energy. The effect of charge is as follows: The has a charge of +2q e , the has a charge of q e , and the . Q: Radiation can be absorbed or shielded by materials, particularly what material used to make protective aprons worn by x-ray administrators? Choices: - cotton - steel - carbon - lead A:
Answer: lead
*Question*
Answer the following question given this paragraph: The total heat absorbed as the ice at -30C is heated to steam at 140C is 113.4 kJ. The largest absorption of heat comes during the vaporization of the liquid water. Q: The largest absorption of heat comes during the vaporization of what? Choices: - ice - carbon dioxide - magma - liquid water A:
**Answer**
liquid water
(Question)
Answer the following question given this paragraph: Not so fast. The mesosphere is the least known layer of the atmosphere. The mesosphere lies above the highest altitude an airplane can go. It lies below the lowest altitude a spacecraft can orbit. Maybe that's just as well. If you were in the mesosphere without a space suit, your blood would boil! This is because the pressure is so low that liquids would boil at normal body temperature. Q: What atmospheric layer lies above the highest altitude an airplane can go and below the lowest altitude a spacecraft can orbit? Choices: - stratosphere - troposphere - thermosphere - mesosphere A:
(Answer)
mesosphere