Answer:
Abstract
Nitrous oxide has been used therapeutically as an anesthetic and an analgesic for more than 100 years. The anesthetic effect is thought to be mediated primarily by the reversible inhibition of the N-methyl-d-aspartate type of glutamate receptors resulting in inhibition of excitatory glutamatergic neurotransmission. Nitrous oxide exerts it analgesic effects via activation of opioidergic neurons. Most significant human exposure to nitrous oxide occurs in medical settings either by therapeutic administration or as unintended exposure:
If the rocks are layered on a fine scale
If the rocks are homogenous
If the crystals in the rock vary in size
Answer:
A. P and S waves
Explanation:
P waves are compression waves while S waves are shear waves. P-waves are usually faster than S-waves (about 60% faster). P and S waves are called body waves because they move through the interior of the earth.
When an earthquake occurs, P and S waves are produced. A seismic recording station an be used to record the arrival of these two waves. Since the P wave is faster than the S wave, hence the P wave would first arrive at the station. The earthquake epicenter can be determined by the difference in time of arrival between the P and S wave.
There's multiple reasons for the changes of seasons on the Earth, the most important being the elliptical orbit of the Earth around the Sun, its inclination, and the angle by which the Sun's rays are falling on the Earth.
Because the Earth's orbit is elliptical, in certain parts of the year it is closer to the Sun, and in certain parts of the year it is further from the Sun. When the Earth is closer to the Sun, it speed increases slightly, and that makes the Earth cooler, and when it is further from Sun, its speed decreases by little, and the Earth is warmer.
The inclination of the year allows for one half of the planet to get more Sun light in one part of the year, and the other half to get less, while in the other part of the year, the half that was getting less Sun light gets more, while the one that was getting more is getting less.
The angle of the Sun's rays is directly connected to the inclination of the Earth and its shape. The parts that get the Sun's rays at an angle of 90 degrees or close to that are warmer, and as the angle is becoming smaller and smaller the parts of the Earth become colder and colder because the rays are dispersing over a much larger area.
Most of West Africa was colonized by France.