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Earth is the scientific name
The names of comets vary by where you are, but the scientific name is always the same.
The scientific name for tornadoes are Cumulonimbus Tuba because Tuba has the same shape as a tornado and Cumulonimbus clouds.
Crux
Polaris
It has a pentagon base and it is a pyramid
pentagonal pyramid
equalateral triangle
name which containig triangle prism and triangle pyramid
A hexagonal based pyramid is the best description since it is not ambiguous. The shape is a heptahedron but that name could also apply to a pentagonal prism as well as some exotic shapes.
A cone by definition has only two sides. A five-sided pyramid can refer to either a square-based pyramid (four angled sides and the base) or a pentagonal-based pyramid (five visible sides).
A six sided polyhedron is a hexahedron. This may be a triangle based dipyramid, a pentagonal pyramid of a variant of a parallelepiped.
One base, which is a pentagon.
A hexagonal pyramid is one possibility. A pentagonal bi-pyramid is another. There are others.
pentagonal pyramid
A six sided cone is a pyramid technically, and it would be a hexagonal pyramid (if six sides does not include base) or a pentagonal pyramid (if including base.)
a tetrahedron (triangular-based pyramid) has 5 triangular faces. * * * * * No. A tetrahedron (as the name should suggest) has 4 faces - not 5. The question does not preclude additional sides nor faces. The answer, in fact, is a pentagonal pyramid.