When two separate wave trains meet they add to or subtract from one other in an interaction called ____________. Fill in the blank(s) with the appropriate word(s)
interference
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A problem with substituting plastics for metals, to conserve the metals is that many plastics are made from our limited supply of oil.
Answer the following statement true (T) or false (F)
Because the distinctive eye forms at wind speeds of about 119 km/hr (74 mph), this wind speed defines the threshold where a tropical storm has grown strong enough to be called a hurricane.
Answer the following statement true (T) or false (F)
By which century had agriculture spread widely throughout the Old World and much of the New World?
A) 1300 AD B) 1400 AD C) 1500 AD D) 1600 AD E) none of the above
The continental rise typically ends at a(n) ________ at a depth of about 5 kilometers.
A. slope B. mid-oceanic ridge C. abyssal plain D. continental slope E. trench