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dino 7
"Why did the dinosaurs disappear?"
Question | Answer |
---|---|
extinct | no longer living or existing |
brachiosaurs | dinosaurs with long necks, nostrils above eyes, and forelegs longer than hind legs |
stegosaurs | a dinosaur with a short neck, small head, and long hind legs |
triceratops | a dinosaur with a horn above each eye and a horn on its nose |
tyrannosaurs | large dinosaurs with small forelimbs and large head |
extinct | no longer living or existing |
paleontologists | scientists who study forms of life existing in prehistoric times |
migrated | moved from one region to another |
adapt | to change to fit new conditions |
pterosaur | an extinct flying reptile |
asteroid | one of the thousands of small planets that orbit the sun |
eruption | a sudden, violent bursting |
geology | the study of the origin of the earth |
iridium | a hard and brittle metal |
rift | an opening caused by splitting; a narrow crack in a rock |
continents | the seven main land areas on the earth |
ancient | very old |
minerals | substances formed in the earth by nature |
geologists | scientists who study the origin, history, and structure of the earth |
molten | melted by heat |
convection | -the transfer of heat by motion, especially an upward motion |
atmosphere | all the air around us |
climate | the usual weather that occurs in a place, including the average temperature and average amounts of rain or wind. |
average | typical or usual level |
nitrogen | a colorless, odorless gas that makes up about four fifths of the atmosphere. All plants and animals need nitrogen. |
oxygen | a colorless, odorless, tasteless gas. It is needed for animals and plants to live. |
argon | a colorless, odorless gas that makes up about one percent of the earth's atmosphere |
carbon dioxide | a colorless, odorless gas that is composed of carbon and oxygen and does not burn. It is produced when animals breathe and when fuel containing carbon burns. |
methane | a colorless and odorless gas that burns easily; used as fuel |
radiation | the process of giving off energy in rays or waves |
meteorologist | scientists who study the atmosphere |
absorb | in and become part of |
equations | mathematical statements to show that two things are equal |
fertile | able to produce crops; rich |
economies | the managing of money and materials |
informed | aware; knowledgeable |