Which of the following statements is true? a. the equator is warmer than the poles because the sun's energy is spread over a larger area. b. the top layer of rock in a sedimentary bed is older than the bottom layer. c. fossilization depends on slow burial and exposure to large amounts of oxygen. d. global winds are caused by warm air rising near the equator and cold air sinking near the poles.

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2