How do echo sounders work and what kind of information can they provide about the ocean floor?
?Echo sounders changed the way scientists study the ocean floor. Echo sounders bounce sound waves off the ocean floor gathering information about depth and contour. Sound waves are emitted from a ship and travel to the ocean floor and then they are reflected back to the ship. The depth is calculated by taking the sound wave velocity and multiplying it by the round-trip time, then divided by 2 (D=V(T/2)). Initially, this technique was very popular in measuring depths but was further applied to defining ocean floor contours and features.
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For the graph shown above of animal species A and animal species B, which animal is the predator and which animal is the prey species?
What will be an ideal response
What are the effects of assimilation on magma composition? What will be an ideal response?
In general, problems caused by economic activities are
A) characteristic of small populations. B) usually temporary. C) addressed by laws and public policies. D) not environmental problems.
Continental crust is mainly composed of ________, whereas oceanic crust is mainly composed of ________
A) olivine; basalt B) limestone; gabbro C) granite; basalt D) gabbro; granite