What forms when air masses with different temperatures meet?
a. storms.
b. thunder.
c. fronts.
d. currents

What will a positive and a negative charge do if they are separated from each other?

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g