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2 answers:
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Answer:
a). grains
b).
c). years
Step-by-step explanation:
a). Given Sahara desert has an area of approximately = 9400000 km²
= 9400000×(10000000000) cm²
= cm²
Depth of the desert = 150 m
= 15000 cm
Volume of desert = Area × Depth
=
= cm³
Since 1 cm³ holds sand grains = 8000
Therefore, Grains in Sahara Desert =
=
b). Since 1 cm³ = 8000 grains
1 grain = cm³
c). A truck can carry sand = 20.5 m³ Or
= cm³
Now time taken to recreate Sahara Desert = seconds
=
= seconds
= years
= years