Federalism is the sharing of power between national and state governments
Answer:
<u>Helium</u>
1. Helium is air
2. Helium is lighter
3. Helium can make things float
<u>Aluminum</u>
1. Aluminum is metal
2. Aluminum has a greater mass than helium
3. Aluminum can be used in many ways
Explanation:
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The correct answer is frequency
The Doppler effect is characterized by the change in the sound frequency emitted by a source, perceived by an observer when there is relative movement. A typical example of the Doppler effect is the case of an ambulance with the siren on, during the approach or removal of an observer.
Answer:
The result was that Athens won the Persian wars and that they stopped Persia from conquering Europe
Explanation:
