How does seafloor spreading explain the movement of the continents? What will be an ideal response?
With seafloor spreading, the continents and oceanic crust move together as part of large plates. The
plate is pushed by the formation of new ocean crust and pulled by the subduction of old ocean crust.
New crust forms due to seafloor spreading.
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Indicate whether the statement is true or false
Roundup Ready corn is a transgenic crop that is resistant to the herbicide Roundup (glyphosate). Which one of the following would be the greatest concern regarding Roundup Ready corn?
A) Transfer of Roundup resistance to other crops, such as soybeans B) Eventual loss of this trait from Roundup Ready corn due to hybridization C) Evolution of herbicide resistance in weeds that commonly infect cornfields D) Lower yields produced by Roundup Ready corn
Which of the following would best represent a clumped population distribution pattern?
A) a pod of 40 migrating gray whales in the Bering Sea B) pine trees within a pine plantation C) earthworms in the soil of a garden D) eagles nesting in the tallest trees in the Grand Canyon E) oaks planted on city streets
Igneous rocks formed by explosive volcanic activity have a texture that is ____
A)aphanitic B)porphyritic C)glassy D)phaneritic E)pyroclastic