Answer:
Sea-floor spreading occurs in the oceanic ridges. In there, volcanic activity, together with the gradual movement of the bottom, form new oceanic crust. This allows a better understanding of the continental drift explained by the theory of plate tectonics.
The greatest evidence for Sea-floor spreading is the oceanic trenches, the oceanic ridges, the magma protruding to the surface and the new seafloor.
In previous theories, continents were assumed to be transported across the sea. Harry Hess, in the 1960s, proposed the idea that the seabed itself moves as it expands from a central point. The theory is now accepted, and the phenomenon is thought to be caused by convection currents in the upper layer of the mantle.
Answer: 94 seconds
Explanation:
An exact solution will require calculus, since the acceleration is not constant.
M*dV/dt = -fk = -75V
dV/V = -(75/M)dt
Since you have separated variables to opposite sides, the differential equation is easily integrated.
Therefore,
V2/V1 = -ln2 = (-75/M)T
where T is the time interval.
Then we have that,
T= (M/75)*ln2 = (1020/75)*0.693
= 94 seconds
Answer:
1) when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water
2) sulfur dioxide and nitrogen oxides
3)mixtures of sodium bicarbonate,magnesium hydroxide, calcium carbonate
4)
A) sulfuric acid
B) calcium ammonium nitrate
C) calcimine, kalsomine, calsomine, or lime paint
D) ammonium hydroxide
5)
A) Na2SO4 + H2O
B) NaCl + H2O + CO2
6) I can't find anything to help with the answers
7)
A) Can't find any thing
B) copper oxide
<span>from a trough to the rest position and from a crest to the rest position.
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We expect the last colour of the sunset to be on the red end of the visible spectrum because of the dispersion of light. Due to the particles present in the atmosphere, the light rays undergo scattering and the light of shorter wavelengths like blue gets dissipated but light rays of longer wavelengths travel long distances without getting dissipated.
Dispersion of light is the phenomenon in which the light from the sun is split into its constituent colours which are Violet, Indigo, Blue, Green, Yellow, Orange, and Red when it passes through a prism or due to the particles present in the earth's atmosphere.
To know more about the dispersion of light go here
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