During the so-called "Classic Maya" period, Tikal (in what is today Guatemala) was a thriving urban center of nearly 100,000 people, cut into the middle of the Central American rain forest.
Painting by Peter E. Spier, National Geographic
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military land forces.
person who studies space and the universe beyond Earth's atmosphere.
to reach a conclusion by mathematical or logical methods.
large settlement with a high population density.
complex way of life that developed as humans began to develop urban settlements.
edge of land along the sea or other large body of water.
mixture of decaying organic material, such as food waste and plants.
to encourage the growth of something through work and attention.
learned behavior of people, including their languages, belief systems, social structures, institutions, and material goods.
to figure out or interpret.
to overcome an enemy or obstacle.
to ruin or make useless.
to overpower or control.
to grow or get larger.
to transport goods to another place for trade.
written language using images to represent words.
plateau or elevated region of land.
to enter and attack.
watering land, usually for agriculture, by artificial means.
type of government with a king or queen as its leader, or the land ruled by that king or queen.
set of sounds, gestures, or symbols that allows people to communicate.
people and culture native to southeastern Mexico and Central America.
study of weather and atmosphere.
geographic area protected by the national government of a country.
series of links along which movement or communication can take place.
the Western Hemisphere, made up of the Americas and their islands.
place or building equipped and used for making observations of astronomical, meteorological, or other natural phenomena, usually equipped with powerful telescopes.
black glass formed as lava cools above ground.
large home or mansion, often the home of a leader or dignitary.
area of tall, mostly evergreen trees and a high amount of rainfall.
any area on Earth with one or more common characteristics. Regions are the basic units of geography.
knowledgeable or complex.
area or region where a nation or cultural group has cultural, economic, military, or political influence.
(200-750) ancient civilization in what is now central Mexico.
flat surface created on a steep hillside.
to develop and be successful.
buying, selling, or exchanging of goods and services.