The best answer is :
It is designed to be thrown to someone in trouble.
Type IV PFD refers to the fourth<span> level of U.S.</span><span> Coast Guard's (USCG) classification </span>for private<span> flotation devices. </span>sort<span> IV PFDs are </span>carried<span> on boats as </span>a tool which will<span> be thrown to a drowning person. S</span>ort<span> 4 PFDs </span>also is referred to as<span> a throwable </span>float<span> or </span>sort four<span> PFD.</span>
It because they give us oxygen and without oxygen we would all die from oxygen deprivation.
the process that gives us oxygen is photosynthesis
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"When magma reaches earth's surface it is called lava. It may pour out in gentle streams called lava flows or erupt violently into the air. Rocks ripped loose from the inside of the volcano or torn apart by the gas may be shot into the air with the lava".
-Google
The two types of eruptions are :
Explosive eruptions and effusive eruptions.
Answer: Delirium
A person who suffers delirium experience lack of
awareness of oneself or one’s surroundings. Delirium is a serious disturbance
in mental abilities results in confused thinking and reduced environmental awareness.
This manifestation is transient and usually reversible but it can occur at any
age especially in elderly who have previously compromised mental status.
