Answer: D. The economy was struggling in much of 2009.
Explanation:
In 2009, the ownership of mp3 players seemed to dip from April to September and only recovered afterwards.
Laptop computer ownership may not have decreased but stopped growing and remained the same in the same period. Desktop computer decreased in ownership and even Cellphone ownership decreased as well.
This means that all four gadgets were affected in 2009 in a negative manner which means that the economy struggled in that time period in 2009.
I believe your answer is the year 2020
True, A 'planar projection map' is helpful for sea navigation.
<u>Explanation:
</u>
A 'planar projection map' that shows the particulars of the globe in a flat surface projection. The pictures projected by the map are shown in rectangular-shaped. If any other map such as Cylindrical map is used then, the edges are not so perfect, they show distortion. With the help of all three coordinates, it shows a 3-D picture of the globe and its objects which can be considered almost as real as the actual object. They are also known as azimuthal projections and are mostly used in projecting polar regions.
The area of square a is 100
<span>Erosion by rivers is a main valley-forming
process; other processes, such as movement of the earth's crust and
glaciers, also have an important part in some cases. The rate at which a
river deepens its valley depends on several factors.</span>