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Domesticated animals and crops originate from various parts of the world.
Regular dice can be used for solving statistical and probability exercises.
To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
Division of space by three intersecting planes in several different arrangements.
The United States entered World War II after the devastating attack by the Japanese navy.
The Crow are Native Americans who inhabited the Yellowstone River valley.
Panpipes (or pan flutes) are composed of several pipes of gradually increasing length.
The bell is a percussion instrument and an idiophone. Many types of bells exist.
A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.
Groundwater and aquifers are types of underground waters.
Cold and warm fronts are formed where bodies of cold and warm air meet.
Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.
The guitar is a plucked string instrument available in various shapes.
The trumpet is a musical instrument with the highest register in the brass family.
Drums are played by striking the membrane. There are many versions of drums.
The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.
A string quartet consists of four string players, it appeared in the late 18th century.
The river and marine sailing boats of ancient Egypt were one-masted, oared boats
The ruler of the vast Mongol Empire was the Khan.
The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.
The head of the Byzantine Empire, the direct continuation of the Roman Empire, was the emperor.
The most important weapons of medieval Arab warriors were the bow and the sword.