Question

a unit of area often use in expressing area of land is the hectare define as 10 raised to power 4 meter square an open pit coal mine consume 77 hectare of land dowen to depth of 26 m each year what vol7me of earth in cubic km is removed in this time
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Answer 1

Answer:

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Answer 2

Answer:

2.002 km3

Explanation:

1 hectare = 10 to the power 6 m2

So, 77 hectare = 77 x 10 to the power 6 m2

                        => 770 to the power 6 m2

Volume = 77 x 10 to the power 6 x 26

             = 20020 m2 x 10 to the power 6

             => 2002 x 10 the power 6

1 km = 1000m

1m = 1/1000 km = 10 to the power -3 km

1 m3 = (10 to the power -3) whole cube km3

        => 10 to the power -9 km3

So, Volume = 2002 x 10 to the power 6 x 10 to the power -9

                   =>2.002 km3

Hope This Helps You :D