(v) to leave a place, thing, or person, usually forever.
Abandon
(n) an army or country that uses force to enter and take control of another country.
Invader
(n) an advanced stage of human society, in which a high level of culture, science, industry, and government has been reached.
Civilization
(n) someone who studies the buildings, graves, tools, and other objects of people who lived in the past.
Archaeologist
(n) a situation in which there is not enough of something.
Lack
(n) something valuable (such as money, jewelry, gold, or silver) that is hidden or kept in a safe place.
Treasure
(n) the broken parts that are left of an ancient building or town.
Ruin
(n) a severe snowstorm with strong winds.
Blizzard
(v) to fall down suddenly because of pressure or having no strength or support.
Collapse
(n) a large group of people who live together, sharing the same language, culture, and history, especially those who do not live in towns or cities.
Tribe
(n) a long period where there is little or no rain, leading to a shortage of water.
Drought
(v) to find something for the first time, or something that had not been known before.
Discover
(n) a severe tropical storm with high winds and heavy rain.
Hurricane
(n) the number of people living in a particular country, area, or place.
Population
(n) a large amount of water covering an area that is usually dry.
Flood
(n) an extremely large wave, usually caused by undersea earthquake, volcanic eruption, or coastal landslide.
Tsunami
