Q: Answer the following question given this paragraph: Another example is carbon dioxide. This gas is produced from a variety of reactions, often by the burning of materials. The structure of the gas consists of one atom of carbon and two atoms of oxygen. Carbon dioxide production is of interest in many areas, from the amount we breather out to the amount of the gas produced by burning wood or fossil fuels. By knowing the exact composition of carbon dioxide, we can make predictions as to the effects of different chemical processes. Q: The structure of the gas carbon dioxide consists of one atom of carbon and two atoms of what? A: | OPTIONS:
- sulfur
- methane
- Helium
- oxygen
A: oxygen

Q: Answer the following question given this paragraph: Currents are like rivers flowing through the ocean. Rivers always flow downhill because of gravity. What do you think causes ocean currents to flow?. Q: What causes rivers to always flow downhill? A: | OPTIONS:
- slope
- pressure
- diffusion
- gravity
A: gravity

Q: 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? A: | OPTIONS:
- light
- sound
- microwaves
- electricity
A: electricity

Q: Answer the following question given this paragraph: A resource is renewable if it is remade by natural processes at the same rate that humans use it up. Sunlight and wind are renewable resources because they will not be used up ( Figure below ). The rising and falling of ocean tides is another example of a resource in unlimited supply. A sustainable resource is a resource that is used in a way that meets the needs of the present without keeping future generations from meeting their needs. People can sustainably harvest wood, cork, and bamboo. Farmers can also grow crops sustainably by not planting the same crop in their soil year after year. Planting the same crop each year can remove nutrients from the soil. This means that wood, cork, bamboo, and crops can be sustainable resources. Q: What is the term for a resource that is used in a way that meets the needs of the present without keeping future generations from meeting their needs? A: | OPTIONS:
- tolerable
- innovative
- structural
- sustainable
A: sustainable