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Which of the following describes the slowest change on earth's surface?
A) Gravity pulls an area of wet soil and rock downward in a landslide
B) An earthquake releases energy that built up below Earth's surface
C) Lava explodes from a volcano on an island
D) A canyon forms as water carries away weathered bits of rock

  • Science - ,

    Which process takes the longest time?
    A) The wind erodes a sand dune on the beach
    B) A maple tree grows to be 100 feet tall
    C) High mountains are eroded to gentle hills
    D) A river floods and changes its course

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