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.
well A and B are not correct because the earth is always tilled but the correct answer would be the equator
Answer:
b. increased temperatures
Explanation:
- The primary reason for the productivity in the Photo zones is due to the influence of major factors like the Nutrients, light, and grazing of animals. The rate at which the plants are eaten by herbivorous.
- Upwelling of cool, water from the bottom and interaction of warm waters from the above that derives nutrient-rich water to the surface. These upwelling can be consciously be caused by the winds and the depth of light penetrates down the layer of the water.
- As the intensity of water decrease with depth and with the concentration of nutrient the photic zone becomes shallower.
