Answer the following question given this paragraph: Earth rotates on its axis once each day and revolves around the Sun once every year. Q: Earth rotates on its axis once each day and revolves around the sun how often? Choices: - once each month - ever 3 years - every other year - once each year A:
once each year
(Question)
Answer the following question given this paragraph: After trees are cut, logging companies often move these materials down a river to a sawmill where they can be shaped into building materials or other products. The logs float on the water because they are less dense than the water they are in. Knowledge of density is important in the characterization and separation of materials. Information about density allows us to make predictions about the behavior of matter. Q: What property allows cut logs to float on water? Choices: - polarity - heat - precipitation - density A:
(Answer)
density
Ques: Answer the following question given this paragraph: Fossil fuels are compounds of carbon and hydrogen, called hydrocarbons . Hydrocarbons can be solid, liquid, or gas. The solid form is coal. The liquid form is petroleum, or crude oil. The gaseous form is natural gas. Q: What do we call the solid form of hydrocarbons? Choices: - methane - shale - bauxite - coal A:
Ans: coal
(Q).
Answer the following question given this paragraph: A familiar example may help you understand the vibrating electric and magnetic fields that make up electromagnetic waves. Consider a bar magnet, like the one in the Figure below . The magnet exerts magnetic force over an area all around it. This area is called a magnetic field. The field lines in the diagram represent the direction and location of the magnetic force. Because of the field surrounding a magnet, it can exert force on objects without touching them. They just have to be within its magnetic field. Q: A magnet can exert force on objects without touching them, as long as they are within what? Choices: - audio field - molecular field - gravitational field - magnetic field A:
(A).
magnetic field
Ques:Answer the following question given this paragraph: sweating. These vessels become smaller when it is cold outside and larger when it is hot (so more fluid flows, and more energy is transferred). The body also loses a significant fraction of its heat through the breathing process. While convection is usually more complicated than conduction, we can describe convection and do some straightforward, realistic calculations of its effects. Natural convection is driven by buoyant forces: hot air rises because density decreases as temperature increases. The house in Figure 14.17 is kept warm in this manner, as is the pot of water on the stove in Figure 14.18. Ocean currents and large-scale atmospheric circulation transfer energy from one part of the globe to another. Both are examples of natural convection. Q: Natural convection is driven by what forces? Choices: - magnetic - thermal - gravitational - buoyant A:

Ans:buoyant
Answer the following question given this paragraph: In plants and algae, photosynthesis takes place in organelles called chloroplasts. Chloroplasts contain stacks of membranes called thylakoids, which contain chlorophyll. Thylakoids are surrounded by a fluid-filled space called stroma. Q: In plants and algae, photosynthesis takes place in which organelles? Choices: - stems - fibroblasts - cells - chloroplasts A:
chloroplasts