PLZ HELP WILL MARK BRAINLEST! Which statement best describes a surface wave?

O A. It forms when matter vibrates in a direction that is perpendicular to the direction of the motion of the wave.

O B. It occurs at the boundary of two different mediums, such as air and water

O C. It forms when matter vibrates in a direction that is parallel to the direction of the motion of the wave.

O D. It forms when electric and magnetic fields vibrate perpendicularly to each other.

h let me think

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.