Chapter 10 - science - a trip through geologic time Crossword
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
 
 
Down: 1) a fossil formed when an organism buried in sediment dissolves, leaving a hollow area2) a type of fossil that provides evidence of the activities of ancient organisms3) a fossil that is a copy of am organism's shape, formed when minerals seep into a mold4) a vertebrate with scaly skin that lays eggs with tough leathery shells5) a vertebrate that lives part of its life on land and part of its life in water7) a trace of an ancient organism that has been presereved in rock8) the breakdown of a radioactive element releasing particles and energy10) a substance in which all the atoms are the same that cannot be broken down into other substances12) the geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it13) a type of fossil consisting of an extremely thin coating of carbon on rock15) a place where an old, eroded rock surface is in contact with a newer rock layer18) a fossil in which minerals replace all or part of an organism21) an animal without a backbone23) the process by which all the different kinds of living things have changed over time29) a break or crack in Earth's lithosphere along which the rocks move Across: 6) a type of rock that forms when particles from other rocks or the remains of plants and anials are pressed amd cemented together9) the time it takes for half of the atoms of a radioactive element to decay11) a record of the geologic events and life forms in Earth's history14) the age of a rock given as the number of years since the rock formed16) a scientist who studies fossils to learn about organisms that lived long ago17) fossils of widely distributed organisms that lived during only one short period19) when many types of living things become extimct at the same time20) a loose collection of ice, dust and small rocky particles, typically with a long, narrow orbit of the sun22) one of the units of geologic time into which geologist divide eras24) one of the three long units of geologic time between Preca,brian and the present25) a warm-blooded vertebrate that feeds its young milk26) an animal with a backbone27) the smallest particle of an element28) the hypothesis that the continents slowly move across Earth's surface30) the age of a rock compared to the ages of rock layers31) describes a type of organism that no longer exists anywhere on Earth32) an igneous rock layer formed when lava flows onto Earth's surface and hardens33) a well-tested concept that explains a wide range of observations34) an igneous rock layer formed when magma hardens beneath Earth's surface
 

 

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