What is an electric current, how does it flow in a wire, and about how fast do the electrons move?
What will be an ideal response?
Electric current is the rate of flow of electric charge in a circuit. In a wire, current is the flow of electrons through the wire. They move at extremely high speeds about the atomic nucleus and through empty space, but in a wire or other conductor they have so many collisions each second that their overall headway is only a small fraction of a centimeter per second. If the current is AC, then electrons don't have any net flow—they vibrate to and fro about relatively fixed positions.
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Continental crust is very buoyant compared with oceanic crust because continental crust is
A) predominantly composed of basaltic rock that contains many air bubbles from successive lava flows. B) predominantly composed of granitic rocks, whereas oceanic crust is composed of basaltic rocks. C) thinner than the oceanic crust, forming a thin upper skin on the oceanic crust below. D) very young and fresh.
Explain the concept of interface in object-oriented technology.
What will be an ideal response?
The lower snowline of the past meant that
A) glaciers existed at lower altitudes. B) there were fewer glaciers. C) there were glaciers at lower latitudes. D) on average, there was less snow than there is today.
Which of the following is a good example of a shield volcano?
A. Andes mountains B. Hawaiian islands C. Mt. St. Helens D. Cascade mountains