Explanation:
Question 1:
It is better to use data from three or more seismic stations to find the epicenter of an earthquake because the intersection of three or more points gives a more accurate location of the epicenter.
- The method used in locating the position of an earthquake is simply by triangulating three or more points.
- Since we know the time of arrival and speed of earthquake waves, we use the distance at suitable scale to draw a circle at the seismic stations.
- The point of intersection of the circle gives the location of the epicenter of the earthquake waves.
- Using 1 or 2 locations will not result in an accurate position determination.
- A single circle from a seismograph station would only give us the region where earthquake must have likely occurred.
- Two circles will narrow down the odds of determining the position.
- Three or more circles gives perfect intersection which shows the position of the epicenter of the earthquake.
Question 2:
Properties of P-waves
- P-waves are known as primary waves.
- The have a velocity of about 5-8km/s
- They are always the first wave to arrive at a seismic station.
- They are propagated longitudinally i.e parallel to their source.
- They can pass through any earth materials be it solid liquids or gases.
- P-waves are body waves that moves within a body
Properties of S-waves.
- They are also known as secondary or shear waves.
- Their velocity is about 1-8km/s
- They are the second to arrive at a seismic station.
- They are propagated transversely to their source.
- They cannot pass through liquids and gases because they cannot be sheared.
- S-waves are body waves.
Question 3:
The conclusion that can be drawn from this is that the waves only pass through a solid material.
- P-waves are elastic seismic waves that can pass through any materials.
- They are always the first to arrive at a seismic station.
S-waves are secondary waves that will only pass through solid because they can shear.
Liquids and gases do not shear and will not allow s-waves to pass through them.
Since no s-waves are seen or recorded on the seismograph, we can infer that the material through which the waves cuts through is a solid alone.
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One of the best ways to use rocks to determine past geography is to look at water lines. Many cliffs contain "stained" waterlines on the surface of the rocks, which shows that water at a certain level used to occupy that area.
The independent variable is time to sun exposure, the dependent variable is the incidence of skin cancer, and the hypothesis is that sunscreen may cause skin cancer.
<h3>What is the Independent variable?</h3>
The Independent variable is the experimental variable that isn't changed across the experiment, while the dependent variable changes in the experiment.
The independent variable is said to be the cause, while the dependent variable can be defined as the effect of a given experiment.
In conclusion, the independent variable is time to sun exposure, the dependent variable is the incidence of skin cancer, and the hypothesis is that sunscreen may cause skin cancer.
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Answer: Yeah what is the question?
Explanation: