Compared to oceanic crust, continental crust is thicker and less dense
Indicate whether the statement is true or false
T
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Sometimes it is useful to make a layer transparent so that the basemap (in this case the imagery) can be seen below the layer. Click on the ellipses below the USA Earthquake Risk layer name and select “Transparency.” Set transparency to 50%.
Where likely sources of debris flows are a short distance upstream and the channel gradient is high, ____
a. a trip wire is more effective than an acoustic flow meter for debris flow warnings b. sirens should not be used in debris early warning systems c. warning time for a debris flow may be too short to allow for evacuation d. the danger to humans from a debris flow is minimized e. debris flows and mudflows will never be covered by flood insurance
The first bacteria probably used ________ instead of water as a source of hydrogen
A) Fe3O4.OH B) H2SO4 C) H2S D) OH-1 E) HCl
Air is best described as a(n) ________
A) chemical compound B) element C) mixture D) colloid E) particulate