When neither air mass has enough energy to move, what front forms?

What would have happened to portugal’s trade if they had not found a way to sail around the tip of africa

Which of the following is a measure of the amount of light a star directly emits? a. luminosity b. wavelength c. brightness d. intensity

Iceland has taken advantage of its geology to meet a. political needs b. energy needs c. cultural needs d. economic needs answer b. energy needs