Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
24 week assessment
| Question | Answer |
|---|---|
| What is the scientifically accepted age of the Earth? | 4.6 billion years old |
| What is uniformitarianism? | Uniformitarianism is the principle of the geologic processes that occurred in Earth's past can be explained by current geologic processes. |
| Who identified uniformitarianism? | James Hutton |
| What does the Law of Superposition state? | A sedimentary rock layer is older than the layers above it and younger than the layers below it |
| What does the Law of Cross-cutting Relationships state? | A fault or igneous intrusion is always younger than the rock layers it cuts through |
| Radiometric Dating-what is half-life? What do the terms "parent and daughter isotopes" mean? | The half-life is the time it takes for half of the radioactive parent isotopes to decay into the stable daughter isotope |
| What is Carbon-14 dating used for? | A method of dating fossils (wood, shells, bones, etc.) that are less than 70,000 years old |
| What is an index fossil? | A fossil that occurs in a rock layer of a particular geologic age-lived for a short time, was very common and world-wide |
| Why are there few fossils found in Precambrian rocks? | There were not a lot of life forms (mostly bacteria), no hard parts to fossilize, and many of the rocks from that time period have been deformed (melted, eroded, faulted) |
| What was the major cause of the Permian extinction? | Many of the inland seas dried up. Many marine invertebrates went extinct |
| What is the major cause of the Cretaceous extinction? | Asteroid strike |
| What marks the boundary between the Pleistocene and the Holocene epochs? | End of the last ice age |
| Identify and define the layers of the Sun's atmosphere. | The photosphere-first layer of the Sun’s atmosphere, and it is the visible surface of the Sun. The chromosphere- layer above the photosphere, and it glows a reddish color during eclipses. The corona-the outermost layer of the Sun’s atmosphere |
| What are auroras? What causes them? Where are they usually seen? | Caused by the interaction of the solar wind and Earth’s magnetosphere. Bright bands of light in the sky mostly seen at higher latitudes. |
| What is the difference between a solar flare and a coronal mass ejection? | A solar flare is an explosive release of energy that comes from the Sun and that is associated with magnetic disturbances on the Sun’s surface. A CME is made up of coronal gas that is thrown into space from the Sun. |
| How does nuclear fusion create energy in the Sun's core? | On the Sun hydrogen is fused into helium. |
| What is a sunspot? | A sunspot is a dark area of the photosphere of the Sun that is cooler than the surrounding areas, and that has a strong magnetic field. |
| What is the average length of the sunspot cycle? | 11 years |
| What is cosmology? | The scientific study of the Univers |
| What is the scientifically accepted age of the universe? | 14 billion years old |
| Explain the Big Bang Theory. | The theory that the universe began as a small point of matter that suddenly and rapidly began expanding outward |
| What is the cosmic background radiation? | Low levels of energy that are distributed evenly throughout the universe. This is evidence that supports the Big Bang Theory |
| What galaxy do we live in? | Milky Way galaxy |
Created by:
morganvanderleest
Popular Earth Science sets