Science Test Ch. 8 Crossword
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
 
 
Down: 1) a type of mammal that includes humans, apes, and monkeys; typically distinguished by opposable thumbs and binocular vision3) an early hominid that evolved more than 3.6 million years ago6) determining whether an event or ojbect, such as a fossil, is older or younger than other events or objects10) a period when a large number of species die out at the same time11) a cell that does not have a nucleus or any other membrane-covered organelles; also called a bacterium12) the period in the geologic time scale beginning about 540 million years ago and ending about 248 million years ago ANCIENT LIFE14) the first primate ancestors16) the single land mass that contained all the present-day continents 200 million years ago17) the family referring specifically to humans and several extinct, human like species, some of which were human ancestors Across: 2) the period in the geologic time scale beginning about 248 million years ago and ending about 65 million years ago MIDDLE LIFE4) determining the age of an object or event in years, usually by measuring the amount of unstable atoms in the sample5) a species of hominid that lived in Europe and western Asia from 230,000 years ago to about 30,000 years ago7) the study of the forces that drive the movement of pieces of Earth's crust around the surface of the planet8) the period in the geologic time scale beginning when Earth originated, 4.6 billion years ago, and ending when complex organisms appeared, 540 million years ago9) fine particles of sand, dust, or mud that are deposited over time by wind or water13) the solidified remains or imprints of a once-living organism15) the division of Earth's history into distinct intervals of time18) a gas molecule that is made up of three oxygen atoms; absorbs ultraviolet radiation from the sun19) describes a species of organism that has died out completely20) the process by which plants capture light energy from the sun and convert it into sugar21) a cell that contains a central nucleus and a complicated internal structure22) for a particular radio-active sample, the time it takes for one-half of the sample to decay23) describes an organism that does not need oxygen24) the period in the geologic time scale beginning about 65 million years ago and continuing until the present day RECENT LIFE25) modern day humans
 

 

Create your own Crossword Puzzle for Free!		  Show Errors as I Type