Which option names the two sides of a sand dune?

Options:

A. windward and leeward

B. east and west

C. north and south

D. port and starboard

The answer is option A "windward and leeward." Sand dunes are formed by wind blowing sand on-top of obstacles and they grow bigger and bigger in till it forms a hill made of sand which is a dune.  The answer is option A because on a hill windward is towards the wind and leeward is behind or behind the hill.

Hope this helps.

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:

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.