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Fossils Age of Rocks Radioactive Decay Geologic Time Scale Hodge Podge 50 50 50 50 50 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 500 500 500 500 500 50 Question: The preserved remains or traces of an organism is called a: Check Your Answer 50 Answer: fossil Back to the Game Board 100 Question: A fossil that formed when minerals replace all or part of an organism is called a: Check Your Answer 100 Answer: Petrified fossil Back to the Game Board 200 Question: Which type of fossil can provide clues about the activities of ancient organisms? Check Your Answer 200 Answer: Trace fossils Back to the Game Board 300 Question: The fossils of organisms that were widely distributed but only lived during a short period of time are called: Check Your Answer 300 Answer: Index fossils Back to the Game Board 500 Question: Which part of organism generally becomes a fossil, the soft or hard part? Check Your Answer 500 Answer: Hard Back to the Game Board 50 Question: The age of rock compared the age of other rocks is called: Check Your Answer 50 Answer: Relative age Back to the Game Board 100 Question: In horizontal layers of sedimentary rock, each layer is older than the layer above and younger than the layer below it. This is called: Check Your Answer 100 Answer: The Law of Superposition Back to the Game Board 200 Question: What is the age of an intrusion of igneous rock in relation to the sedimentary rock layers through which it passes? Check Your Answer 200 Answer: Always younger Back to the Game Board 300 Question: Is a fault younger or older than the rock it cuts across? Check Your Answer 300 Answer: Younger Back to the Game Board 500 Question: Why is Potassium-40 useful for dating very old rocks? Check Your Answer 500 Answer: Because is has a long half-life of 1.3 billion years. Back to the Game Board 50 Question: Radioactive decay occurs when atoms of an unstable element do what? Check Your Answer 50 Answer: break down to form atoms of another element Back to the Game Board 100 Question: The time it takes for half of the radioactive atoms in a sample of a radioactive element to decay is the element’s: Check Your Answer 100 Answer: Half-life Back to the Game Board 200 Question: Radioactive dating enables geologists to know what? Check Your Answer 200 Answer: the absolute ages of rocks. Back to the Game Board 300 Question: Radioactive dating works best with what type of rocks? Check Your Answer 300 Answer: Igneous Rocks Back to the Game Board 500 Question: How do Relative dating and Absolute dating differ? Check Your Answer 500 Answer: Relative dating compares different rocks to one another to see which is younger or older. Absolute dating finds the actual age of the rock. Back to the Game Board 50 Question: The Mesozoic Era is divided into the Triassic, the Jurassic, and the Cretaceous. These divisions of the geologic time scale are called what? Check Your Answer 50 Answer: Periods Back to the Game Board 100 Question: Jawless fish were Earth’s first what? Check Your Answer 100 Answer: Vertebrates – animal with a backbone Back to the Game Board 200 Question: At the beginning of the Paleozoic Era, a great number of different types of organisms evolved (appeared) in an event called the: Check Your Answer 200 Answer: Cambrian Explosion Back to the Game Board 300 Question: Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called: Check Your Answer 300 Answer: Eras Back to the Game Board 500 Question: What do most scientists think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous Period? Check Your Answer 500 Answer: An object from space struck Earth. Back to the Game Board 50 Question: Earth’s atmosphere, oceans, and continents began to form during the first several hundred million years of what time period? Check Your Answer 50 Answer: Precambrian Time Back to the Game Board 100 Question: How did the Earth change about 2.5 billion years when many organisms began using photosynthesis to make food? Check Your Answer 100 Answer: The amount of oxygen in the atmosphere increased. Back to the Game Board 200 Question: A type of organism that no longer exists on Earth is said to be: Check Your Answer 200 Answer: extinct Back to the Game Board 300 Question: The process by which all the different kinds of living things have changed over long periods of time is called: Check Your Answer 300 Answer: Evolution Back to the Game Board 500 Question: In which type of fossil might you find the remains of an insect preserved with little or no change? Check Your Answer 500 Answer: Amber Back to the Game Board