Questions regarding the rigidity of the regions of the earth, the age of the earth and the speed of different types of winds.

I am not sure if I did the following 3 questions properly (please see attached file). Can you please check them?

Advice on calculating earthquake p-wave speeds

PROBLEM: The speed of earthquake P-waves, Vp , can be calculated using the equation below. The quantities p, x and y relate to the physical properties of the rock (and their values are in SI units): p is the density, x describes ease of compression and y describes the rigidity of the rock. ________ Vp = √ x + 4/3 y (divided by p) p calculate the value of Vp if x = 1.6 x 1011 N m-2 y = 6.4 x 1010 N m-2 p = 3.4 x 103 kg m-1 answer in km s-1 then rearrange the equation to make p the subject

the OZONE

1a. Most of Earth's ozone is concentrated in the stratosphere, where it commonly is referred to as the "ozone layer." Is this an actual layer with a defined top and bottom? yes, because the stratosphere Is located on top of the troposphere and below the mesosphere.. 1b. Describe in your own words what the ozone layer "is." The ozone layer is a layer in the stratosphere that holds enough ozone to keep out ultraviolet radiation that comes from the sun. 2. The amount of ozone gradually decreases downward from the stratospheric ozone layer into the troposphere. However, the lower 5 km or so of the atmosphere has slightly more ozone than the atmosphere directly above it. Why do you thin... click for more

Radiometric dating

If a lab reports there are the same number of daughter as parent atoms, the number of half-lives elapsed are 1,2,3, or 4?

Predictions on the future use of our depleting natural resources

1) Could someone please explain to me the predictions on the future use of our depleting natural resources. What actions do you personally take to conserve the Earth's natural resources? If you do not currently take action, explain what you could do within the next year that would help conserve natural resources. 2) In what ways do you think learning about geology could influence that way we think about our environment? What would you tell someone who wants to know why the study of geology is important? What can be learning which one could utilize in the future?