What is the principle of cross-cutting relationships? What will be an ideal response?
An igneous intrusion or fault must be younger than the rocks it intrudes or displaces.
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Vegetation in some parts of the Great Smoky Mountains National Park is threatened by ____ that were introduced to North Carolina from Europe in 1912.
A. mountain goats B. white-tailed deer C. wild boar D. rabbits E. long-horn sheep
How can a hydrogen atom, which has only one electron, have so many spectral lines?
A) The electron is able to move at various speeds. B) The protons in the nucleus are also giving off various light frequencies. C) One electron can be boosted to many different energy levels. D) The atomic radius of the hydrogen atom is relatively large.
In the seismograph shown above, what is the estimated time interval between points A and C?
A) 3 minutes B) 4 minutes C) 5 minutes D) 6 minutes
What is the name of NO2?
A) nitrogen oxide B) nitrogen oxygen C) nitrogen dioxide D) nitrous oxide