What do contour lines represent on a map?

Alow pressure system is formed when an air mass cools over a cool surface and sinks. true or false

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade

What must happen for new french words to be published in official dictionaries? a. they must be approved by the french academy b. they must be voted on by the people of france c. they must be used by famous french writers d. they must be used by philosophers a. they must be approved by the french academy