Astronomers study many different kinds of objects in our Solar System. Which of the following best describes a difference between comets and asteroids?
A. Comets orbit planets, and most asteroids orbit the Sun.
B. Comets are hot balls of gas, and asteroids are made mostly of ice.
C. Comets are made mostly of ice, and asteroids are made mostly of rocks.
D. Comets orbit the Sun between Mars and Jupiter, and asteroids form patterns
in the sky.

The anwser is: wave a has a greater pitch and frequency.

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Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.