About 2,200 whales live in the Pacific ocean for Alaska to Mexico.
Answer:
The A horizon will be relative large with a high content of sand.
Explanation:
A desert, as it is, is covered with very fine sediments in most cases, ranging from medium and small rocks to fine sand. If the climate conditions were to change where there is a desert and the climate became more temperate, the soil will change as well relatively quickly. What is actually now the surface of the deserts will become the new soil's A horizon while on top of it a 0 horizon will form.
The A horizon in a former desert will become very fertile and it will be able to support lush vegetation. This will be the case because it will have a very high content of sand, thus it will be very airy and soft. The newly formed O horizon made out of biomass on top of it will wash away to the A horizon, increasing its fertility further by adding a big amount of decomposed biomass to it.
The main reason why the tectonic plates move is the conversational currents. There is magma between the upper mantle and the asthenosphere that heats up at the upper mantle. The weight is so small that the magma rises with the help of these conversational currents. When the magma has ascended towards the asthenosphere, it has nowhere to go so the magma lies along the asthenosphere. There the magma cools down again because the asthenosphere is colder than the upper mantle, which makes the magma heavier and goes back down to the upper mantle, where the magma heats up again and everything starts all over again and so it goes on over and over again. Scientists have concluded that the earth's gravity causes two other processes that also cause the tectonic plates to move.
Ridge push - in the spreading zones, the sides of the tiles are raised and slide to the side as in a slide.
Slab pull - when a plate is pulled down by gravity in a subduction zone like an anchor.
Answer: 1- Option (D)
2- Option (A)
Explanation:
The green house gases plays a significant role in the earth's global temperature. In absence of green house gas, the earth would have been very much cold and life would would be difficult to exist. The average global temperature would have been about -15°C to 25°C. So the most favorable answer given here is that the<u> earth's temperature would have decrease by about 60°C</u>.
<u>Carbon dioxide (CO₂) is not the most abundant green house gas</u>. It is the second most abundant. The present composition of CO₂ in the atmosphere is about 0.04% by volume. A small increase in the CO₂ level, can lead to a global rise in the temperature. Hence, <u>the above statement is false.</u>
