Explanation:
well there is nothing there and it could be different by diffrent objects, idk
Answer:
a. 250kg I think it's the right answer. hope it helps:)
Yesterday was the day that we got canceled on it so we had a lot
Answer: A device records the time it takes sound waves to travel from the surface to the ocean floor and back again. Sound waves travel through water at a known speed. Once scientists know the travel time of the wave, they can calculate the distance to the ocean floor.
Explanation:
Usually to preserve the organisms (maybe the organisms are endangered species or need to be protected in some other way). Another reason could be for the benefit of mankind (for example, an artificial river provides recreational purposes)
