<span>They act like dams or form long ridges of land.</span>
<u>Answer:</u>
<em>Anytime observations need to be clarified. When an unusual condition need to be shown for later reference.</em>
<u>Explanation:</u>
Instead of just recording the data the is sometimes important to be sketched out as the data observed is needed to be clarified and also sometimes there is an unusual condition that occurs and hence, it is important to sketch it so that it can be used for later reference.
<em>Therefore, when we are aware of the situation we need not sketch the data.</em>
<h2><u>Answer:</u></h2>
Henan, a region in Central China's Yellow River Valley, is generally perceived as where Chinese human progress started. There are 4 antiquated capitals inside its fringes. Luoyang, capital amid various traditions, is home to Baima Si (White Horse Temple).
In November 2013, after the Third Plenum of the eighteenth Central Committee of the Chinese Communist Party, China reported the choice to loosen up the one-kid arrangement. Under the new strategy, families could have two kids in the event that one parent, as opposed to the two guardians, was a single kid.
Sand sheets and dunes cover approximately 25 percent of the Sahara's surface.
