Why are there different types of volcanoes and different volcanic eruptions?
What will be an ideal response?
Answer: Volcanic phenomena and volcanic landforms closely depend on two properties of magma: gas content and viscosity. Gas content determines how explosive eruptions will be and the relative proportion of lava flows and pyroclastic deposits that eruptions will produce. More gas-rich magmas are more explosive. Viscosity determines whether lava flows are thin and widespread, or thick and short. Lower viscosity produces more fluid flows. Viscosity and gas content are in large part determined by magma composition, and both properties increase with increasing silica content.
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A) north edge. B) east edge. C) south edge. D) west edge.
Mutations involve some kind of change in _____
A)species B)chromosomes C)alleles D)offspring E)populations
Which of the following stream properties tends to increase downstream?
A) stream power per area of stream bed B) shear stress C) sediment load D) grain size of bedload
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Answer the following statement true (T) or false (F)