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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The correct answer is option B a molecule.
Cells are the basic structural and functional units of living organisms. If a bunch of keys represents a cell, each key in the bunch represents a molecules. The levels of organization in an organism is as follows.
atom ⇒ molecule ⇒ cell ⇒ tissue ⇒ organ ⇒ organ system ⇒ organism.
Molecules represent the keys in a key bunch. A molecule is made up of one or more atoms held by chemiclal bonds. A cell is made up of various biomolecules. The cell wall consists carbohydrates, cell membrane consists of fats and proteins, the cytoplasm of the cell consists of water molecules, proteins, fats, carbohydrates and the nucleus has the biomolecules called the nucleic acids. Thus, many such biomolecules make up a cell.
Organ. They do many special things that help us work right. Hope this helps.
<span>There is more than one major source of air pollution
1-the combustion of coal, oil, gas and other fuels for generating 2- electricity;burning gasoline, diesel and other fuels for transportation;
3- emissions from various industrial processes;
4-burning wood and other fuels for heating and cooking;
5- agricultural burning, land clearing and other man-made fires; and
<span>6- natural sources, including volcanoes, forest fires and dust storms.</span></span>
The choices can be found elsewhere and as follows:
<span>atural and synthetic
metabolites and nonmetabolites
proteins, carbohydrates, lipids, and nucleic acids
organic compounds and inorganic compounds
I think the correct answer from the choices is the third option. The c</span>lassifications of matter used In the 1800 are proteins, carbohydrates, lipids, and nucleic acids. Hope this helps.