The most common economic system in the world is a
closed economy
command economy
mixed market economy
traditional economy.

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

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

One reason that madrid became the capital of spain is because of its