In the pyramids the bases of each are large at the bottom and as they go higher it gets smaller.
all the bases of a pyramids are polygon
Pyramids that do not have parallel faces are known as irregular or non-regular pyramids. Unlike regular pyramids, where the base is a regular polygon and the triangular faces are congruent, irregular pyramids can have bases of varying shapes and sizes, leading to non-parallel faces. An example of this is a pyramid with a base that is a scalene triangle, where the triangular faces can differ in size and shape.
no
There are pyramids of various sizes and descriptions in many countries. However the best known are in Egypt
The Egyptians built they pyramids in different sizes because the wanted to have a little variety. It'd be boring to see the same pyramid in three different places.
There is no "normally." They're of many, many different sizes. You can find a list of Egyptian pyramids, which also gives their height and the size of their bases, in the Related Links section. As you'll see from the list, they range from around 7 meters up to nearly 150 meters.
Population pyramids
Population pyramids
Pyramids are constructed from triangular shapes and can have square or triangle bases
yes
No, none of them do.
cones have round bases