Answer:
The intrusion of I1 or I2 is the youngest event. Without more information, we cannot know which igneous rock is youngest.
Explanation:
The information contained in the question above is not sufficient to determine which of the two igneous rock intrusions is the youngest event, although we can say that it was one of the two.
Even in the absence of a complete answer, it is worth describing what an ignea rock is. Ignal rocks can also be called magmatic rocks and are characterized as a terrestrial rock that originated from the solidification of magma, without having previously undergone a process of sedimentation or metamorphism. As you may already know, magma can solidify and cool on the earth's surface, or inside the earth, giving rise to extrusive and intrusive igneous rocks.
Meriwether Lewis and William Clark helped open the American frontier to settlement by exploring the regions further out west. They mapped these territories and found accessible routes, so that Americans could move further out west and settle the land before the Europeans could claim it. There was also a smaller objective of studying the science and possible economic qualities.
The answer is true ofcourse
Non-rapid-eye-movement sleep (NREMS), rapid-eye-movement sleep (REMS), and W are regulated by several Neurotransmitter systems and a number of diffusible or circulating factors.
Neurotransmitters are chemical messengers that your body can't function without. Their job is to carry chemical signals (“messages”) from one neuron (nerve cell) to the next target cell. The next target cell can be another nerve cell, a muscle cell or a gland.
The DA-containing cells of the VTA and SNc mission to the basal ganglia and the prefrontal cortex, even as these correspond to the PAG mission predominantly to the BFB and midline thalamus. moreover, OX-containing neurons bring projections to the entire forebrain and brainstem arousal structures. three as pointed out by using España and Scammell, four isolated activations of every of the arousal systems already provoke W. but, below regular situations, all of them participate in the occurrence of behavioral and electroencephalographic (EEG) arousal. This depends, in element, on the interconnections of maximum W-promoting structures. similarly, the systems that promote W inhibit neural structures located inside the brainstem and hypothalamus that promote and/or induce NREMS and REMS.
Learn more about Neurotransmitters here:- brainly.com/question/26387085
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