What is main difference between a lake ecosystem and a pond ecosystem?

a. a lake ecosystem has salt water a pond ecosystem does not

b. a pond ecosystem has salt water a lake ecosystem does not

c. a pond ecosystem covers a much larger area than a lake ecosystem

d. a lake ecosystem covers a much larger area than a pond ecosystem

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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