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Discover the significance of fossils in understanding Earth's evolutionary past and the dating methods used by scientists to unravel geological mysteries. Learn about the geological time scale and how Earth's formation shaped life as we know it.
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Question 1 - 10 • are the preserved remains or traces of living things.
Answer 1 – 10 • fossils
Question 1 - 20 • Fossils provide evidence of
Answer 1 – 20 • how life has changed over time
Question 1 - 30 • a hollow area in sediment in the shape of or part of an organism.
Answer 1 – 30 • mold
Question 1 - 40 • evidence of the history of life and past environments on Earth is called
Answer 1 – 40 • The fossil record
Question 1 - 50 • List the steps of how fossils are most commonly formed
Answer 1 – 50 • Organism dies • Organism is buried by sediment • Sediment hardens and preserves fossil
Question 2 - 10 • The number of years since the rock formed
Answer 2 – 10 • absolute age
Question 2 - 20 • In horizontal sedimentary rocks, the oldest layer is at the bottom and the newest layer is on the top and determines the relative ages of rocks
Answer 2 – 20 • The Law of Superposition
Question 2 - 30 • the surface where new rock meets up with a much older rock surface.
Answer 2 – 30 • Unconformity
Question 2 - 40 • What is an index fossil?
Answer 2 – 40 • A fossil that is widely distributedand representsa type of organism that only existedbriefly
Question 2 - 50 • Index fossils are useful because-
Answer 2 – 50 • tell the relative ages of rock layers by how they occur
Question 3 - 10 • As elements break down over time they release particles and energy in a process called
Answer 3 – 10 • radioactive decay
Question 3 - 20 • How fast or slow the radioactive elements decay is always constant (never changing) and the rate of decay is called
Answer 3 – 20 • half-life
Question 3 - 30 • Very useful in dating rocks because it has a long half-life
Answer 3 – 30 • Potassium-Argon Dating
Question 3 - 40 • When carbon-14 is left in an organism, scientists measure this amount that is left to find absolute age. Is the carbon-14 the radioactive element or the new element formed?
Answer 3 – 40 • radioactive
Question 3 - 50 • Why is Radioactive dating is good for igneous rocks but not sedimentary rocks
Answer 3 – 50 • Scientists can date particles but not layers in sedimentary rocks. • Scientists can only date solid rocks.
Question 4 - 10 • a record of the life forms and geologic events in Earth’s history
Answer 4 – 10 • geological time scale
Question 4 - 20 • After Precambrian Time, basic units of the GTS are
Answer 4 – 20 • eras and periods
Question 4 - 30 • three long units of time from Precambrian Time to the present, Ex: The Paleozoic, Mesozoic, and Cenozoic
Answer 4 – 30 • Eras
Question 4 - 40 • Later, _________________________determined absolute age of divisions in the GTS
Answer 4 – 40 • radioactive dating
Question 4 - 50 • What happened during the Precambrian time period?
Answer 4 – 50 • 1st oceans, atmospheres, landforms, and single-celled organisms.
Question 5 - 10 • Scientists hypothesize that the Earth formed at the same time as other planets and the sun at what time?
Answer 5 – 10 • about 4.6 billion years ago
Question 5 - 20 • Earth started as a ball of
Answer 5 – 20 • dust, rock, and ice in space
Question 5 - 30 • As Earth cooled, water vapor condensed forming rain, accumulating to form
Answer 5 – 30 • The oceans
Question 5 - 40 • Without earth’s earliest life forms we would have no…
Answer 5 – 40 • Oxygen/ozone
