The crust is the solid surface of the Earth.
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The flat surface of a solid is called a face. It is a two-dimensional shape that bounds the solid and can be used to describe its properties and characteristics.
A plane
This is an impossibility. If it is a solid figure then it will have more than 1 surface. If it has only 1surface and it is a solid, then it must be a sphere, but the surface of a sphere is not flat is it? By using the word 'solid' then by definition, it is three dimensional and has thickness. A cylinder has no vertices , but it has 2flat surfaces. A vertex is a point where three lines meet, such as on a pyramid, which has 4 vertices. Have I forgotten something or is this a 'trick' question?
A solid shape that can slide is a cube. Its flat surfaces allow it to easily slide along a surface.
A flat side on a solid object means that the surface area is planar and does not curve or bulge in any way. It is a straight and continuous section of the object that does not have any bumps or indentations. It provides a stable base for the object to rest on or be positioned upright.
Jupiter is a gas giant composed mostly of hydrogen and helium, with no solid surface. It does not have hills or a flat surface like terrestrial planets such as Earth.