Answer:
<u>Olivines an Pyroxene, and 5 to 10% of calcium oxides and aluminium oxides</u>.
Explanation:
- The upper mantle of the earth begins just 10 kilometers below the surface of the lithosphere and under the ocean about 35 km and ends to the lower mantel at 670 km.
- Here the temperature range from 200 to 900 degrees celsius, at the boundary is composed of 55% of olivines and 35% of pyroxenes, minerals such as garnet and spinal are also found.
- Lehmann discontinuity is which is an abrupt change caused by the p and s waves occurs at the depth of 220 km. In the upper mantel and lower crust, there exists a discontinuity called the Gutenberg discontinuity.
- Mantel forms the rigid liquid sphere on which the slabs move.
Answer:
The plates will collide in 50,000,000 years.
Explanation:
The tectonic plates are constantly moving. Their movement results in some of them to collide, thus to form convergent plate boundaries. In this case, we have two plates that are relatively far away and the movement is about the average. In order to find out how many years will be needed for the plates to collide we need to:
- convert the km into cm
- divide the distance (in cm) between the plates with the rate of movement of the plate
1 km = 100,000 cm
100,000 x 1,500 = 150,000,000 cm
150,000,000 / 3 = 50,000,000 years
We get a result of 50 million years, meaning the plates will collide in this much time, which in geological terms is actually not that long.
Salutations!
<span>What are the benefits of fair trade?
The term "fair" indicates that everything is even enough. Fair trade is very crucial for the producers and the consumers as well. The following are the examples:
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</span>→ Better prices. (Reasonable and cheap)
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</span>→ Decent working conditions. Working places are hygienic for the workers.
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</span>→ Local sustainability. Resources are used very wisely.
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Hope I helped. </span>
I'm sorry nobody has told you about it yet. They should. You're scared of something just because you don't know what's in there or what it looks like. Summer school is a chance to improve your grades, because it's a class where they teach the same subjects again, so you can review it and learn it a little better than you did the first time. The only difference is that they go a little faster, because the summer is shorter than the regular school year. And that's the whole story. There's nothing to be afraid of. When I went to Summer school a few years ago, I loved it. I started to understand stuff that I didn't understand very well the first time, and I really improved my grade. Good luck.
