1.the natural laws include the law of a. speed limits.
b. gravity.
c. railroad crossings.
d. yielding.

2. which of the following should determine whether you need to speed up or slow down? a. how quickly you need to get somewhere
b. how far above the speed limit you are traveling
c. location of other vehicles in traffic
d. time of day

3. which of the following determines the total stopping distance of a vehicle? a. human-perception time, human-reaction time, and vehicle-stopping time
b. human-reaction distance, braking

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places