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Science 24 week quiz

QuestionAnswer
What is the scientifically accepted age of the Earth? 4.5 - 4.6 billion years
What does the Law of Superstition state? Sedimentary layer on the bottom is older than the layer above it.
What does the Law of Cross-cutting Relationships state? Igneous intrusion or a fault is always younger than the rock layer it cuts through.
Radiometric Dating--- What is it's half-life? daughter isotope? the time required for half of a radioactive isotope to break down by decay to form a daughter isotope.
Parent isotope The original radioactive isotope
Carbon 14-dating Used to determine the ages of wood, bones, shells, and other organic remains embedded in rock.
What's an index fossil? Used to date a rock layer because it's widespread, abundant, and lived during one short time period.
Why are there few fossils found in Precambrian rocks? Rocks are deformed, and life at that time was small and didn't fossilize well.
What was the major cause of the Precambrian extinction? The inland seas disappeared.
What is the major cause of the Cretaceous extinction? From an asteroid crashing into the Earth.
What marks the boundary between the Pleistocene and the Holocene epochs? End of the last ice age.
What cause auroras? Charged particles from the solar wind and magnetosphere interacting with oxygen and nitrogen in Earth's atmosphere.
What causes a geomagnetic storm? Coronal mass ejections
How does nuclear fusion create energy in the Sun's core? Hydrogen nuclei fuse to form helium.
What is the average length of the sunspot cycle? 11 years
What is the scientifically accepted age of the universe. 14 billion (13.7 billion)
Explain the Big Bang Theory The theory that all matter and energy in the universe was compressed into an extremely small volume that is 13 billion years ago exploded and began spreading outward.
What is the cosmic background radiation? Radiation uniformly detected from every direction in space; considered a remnant of the Big Bang.
What galaxy do we live in? Milky Way
Created by: lyndseyjeffries
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