I need help with science I will give brainlist thingy if you answer this right (Right or close enough) If you just answer this for the points I will report you. Here is a picture of these questions. Thank you :)

1. What is a lower pressures system:
2. What is a high-pressure system:
3. If the air pressure starts decreasing, what kind of weather might be approaching? Explain.
Hope that helps!