This mythical Christian monarch was credited with ruling a vast wealthy African empire; the seach for this wealth spurred the Portuguese to explore Africa.

Regional lords in Japan who held great power and wealth and often were self-made men who rose to power from obscurity:

The third Ming emperor, Chengzu (Yongle), authorized a number of voyages under the leadership of

Among the societies of Senegambia, groups of men and women whom the society initiated into adulthood at the same time in a process known as an age-grade system.

Which of the following was a major feature of Japanese Nô theater?

What is/are the important factors that affect the density of seawater?

For any gas, more gas can dissolve in water ____.

In the photic zone, the dissolved oxygen concentration is typically ____ that in the dark waters below the photic zone.

The processing of carbohydrates in cells for the release of energy and CO2 is known as ____.

The term for the total concentration of salts in seawater is ____.