Answer: Because sand dunes protect inland areas from swells, tides, and winds, they must be protected and defended like national treasures. A strong and healthy beach dune is a powerful antidote against coastal erosion. The ocean and the wind can have an unpredictable, destructive force on coastal regions.
The largest desert on earth is the Sahara Desert in Northern Africa. The Sahara is 9,400,000 km2.
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Answer:
Geologic process: Volcanism.
Geographic features: big island of Hawaii, smooth surfaces of the lunar maria, Mars's Olympus Mons.
Geologic process: Impact cratering.
Geographic features: old surface features of the lunar highlands.
Geologic process: Erosion:
Geographic features. Earth's Grand Canyon.
Geologic process: Tectonics.
Geographic features current locations of Earth's continents, Mars's Valles Marineris, Mercury's many long, tall cliffs.
Note that all four processes are interrelated, so although one may be major to a particular feature, others also play some roles in their formation.
