I believe it is the 2nd one because the ground purifies it over a period of a little while.
Answer:
Diameter of a sphere: d = 2 * r , Surface area of a sphere: A = 4 * π * r² , Volume of a sphere: V = 4/3 * π * r³ , Surface to volume ratio of a sphere: A / V = 3 / r . To Measure Diameter of a Small Spherical/ Cylindrical Body Using Vernier's Callipers.
Explanation:
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The displacement covered by the worker in the whole trip is 30km.
The easiest way to solve this problem is using the displacement equation:
Δx = x₂ - x₁
A worker covers a distance of 40 km from his house to his place of
work, and 10 km towards his house back. So:
Δx = x₂ - x₁ = 40km - 10km = 30km
I believe the answer is:
~D. Very dusty irregular galaxy.
Hope this helps!!!