The weather person says, “A fast-moving air mass will pass through the area, bringing rain and lower temperatures.” Which type of weather front is being described?

If i’m not mistaken that would be a cold front.

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

Answera discharge of static electricity;