Answer: 4500 metres
Explanation:
Echo is a reflection of sound wave. It is the sound heard after it has been reflected off the surface of a wall or cliff.
Time = 6 seconds
Speed of sound in water = 1500m/s
distance =?
From the relationship ;
Speed = distance / time
Distance = speed * time
Distance = 1500 * 6 = 9000 metres
Distance here represents the total distance traveled by the pulse that is distance to the seafloor and back to the surface.
Therefore the depth of the water is given by;
Depth = distance / 2
Depth = 9000 / 2 = 4500metres.
Answer:
Option (D)
Explanation:
Historical geology usually refers to the study of the changes and the variation that occurs at or below the surface of the earth. In simple words, it mainly involves the study of past events. This includes the variation and evolution of different life forms that existed on earth over a time of about 3.8 billion years until the present. It basically comprises the important part of geology namely Paleoclimatology, Paleontology and Paleoseismology. This historical geology is also known as Paleogeology.
Thus, historical geology involves the biological changes that occur over a definite time.
Thus, the correct answer is option (D).
Answer:
The moon has cycle phase of about 28 days.
Moon is directly impacted by the light that it absorbs from the sun and reflects this light which can be seen on earth and as the moon and the earth have a same cyclic rotation thus we tend to see the same side of the moon in every the same cycle and hence the patterns are of the new moon, half-moon and the full moon and the half and the new or declining moon again.
1. New moon -- Invisible
2. Waxing crescent. --- Late morning
3. First-quarter. --- Afternoon
4. Waxing Gibbous. ----- Late afternoon
5. Full moon. --- Midnight
6. Waning gibbous. --- early morning
7 . last quarter. --- Late night
8. Waning crescent. --- Pre-dawn
have an amazing day! staysafe:)
I think, among that list, dinosaurs would make the most sense.
Answer:
groundwater is pumped from the well faster than it can flow to replenish what is lost
Explanation:
The cone of depression in the groundwater is formed when "groundwater is pumped from the well faster than it can flow to replenish what is lost."
The pumping of the well, reduces the water level in the well, thereby leading to a gradient shape between encircling aquifer water and the well water. The gradient in turn causes a flow from the encircling aquifer into the well.
During the flow, the water pressures in the aquifer reduce, which eventually form a cone-shaped depression off the well.
