Problem: OPTIONS:
- improve sediment quality
- improve photosynthesis quality
- improve soil texture
- improve soil quality
Q: Answer the following question given this paragraph: Careful farming helps to keep up soil quality each season. One way is to plant different crops each year. Another is to alternate the crops planted in each row of the field. These techniques preserve and replenish soil nutrients. Planting nutrient rich cover crops helps the soil. Planting trees as windbreaks, plowing along contours of a field, or building terraces into steeper slopes all help to hold soil in place ( Figure below ). No-till or low-till farming disturbs the ground as little as possible during planting. Q: What is the purpose of utilizing careful farming practices such as rotating crops or planting nutrient rich crops? A:
Answer: improve soil quality

Problem:OPTIONS:
- conduction
- function
- solar
- activation

Answer the following question given this paragraph: All chemical reactions require activation energy, which is the energy needed to get a reaction started. Q: What type of energy is required in all chemical reactions? A:
****
A: activation

Answer the following question given this paragraph: Sure we can! If you've ever flown on a jet airplane, you've been in the stratosphere. Airplanes fly in the stratosphere, because there is less friction. They get better gas mileage and so costs are lower. There is also less turbulence, so passengers are happier. Can you identify the bottom of the stratosphere in the photo? It's where the clouds begin. Remember that all weather is in the troposphere. Q: Planes fly in what layer of the atmosphere because there is less friction and turbulence? A:
OPTIONS:
- mesosphere
- ozone layer
- crust
- stratosphere
stratosphere

Answer the following question given this paragraph: Coevolution often happens in species that have symbiotic relationships. Examples include flowering plants and their pollinators. Q: What type of evolution often happens in species that have symbiotic relationships? A:
OPTIONS:
- retrogression
- succession
- spontaneous evolution
- coevolution

Answer: coevolution

Question: Answer the following question given this paragraph: The angle at which light bends when it enters a different medium depends on its change in speed. The greater the change in speed, the greater the angle of refraction is. For example, light refracts more when it passes from air to diamond than it does when it passes from air to water. That's because the speed of light is slower in diamond than it is in water. Q: The angle at which light bends when it enters a different medium is known as what? A:
OPTIONS:
- bounce
- frequency
- resonance
- refraction
Answer: refraction

input: OPTIONS:
- carbon shell
- dioxide shell
- dioxide core
- carbon core Now, answer this question: Answer the following question given this paragraph: The Chemistry of Carbon What makes organic compounds ubiquitous is the chemistry of their carbon core. Recall that carbon atoms have four electrons in their valence shell, and that the octet rule dictates that atoms tend to react in such a way as to complete their valence shell with eight electrons. Carbon atoms do not complete their valence shells by donating or accepting four electrons. Instead, they readily share electrons via covalent bonds. Q: What makes organic compounds ubiquitous is the chemistry of their what? A:
A:
output:
carbon core