A: According to BBC, an endoskeleton is a bone structure located in the interior of an animal, and an exoskeleton is a bone structure located on the exterior of an animal. Each type of skeleton has unique advantages and disadvantages in helping the animal survive.
Minerals made of only one element are called NATIVE minerals (i.e., silver, gold, mercury, copper). Minerals composed of compounds are simply referred to as minerals (i.e., quartz, which is made up on silicon and oxygen).
Elements in the Earth s crust. Almost 99% of the minerals making up the Earth s crust are made up of just eight elements. Most of these elements are found combined with other elements as compounds. Minerals are elements or compounds that occur naturally in the Earth s crust. Rocks are mixtures formed of minerals.Just as elements are the building blocks of minerals, so minerals form the building blocks of rocks.lements in the Earth s crust. Almost 99% of the minerals making up the Earth s crust are made up of just eight elements. Most of these elements are found combined with other elements as compounds. Minerals are elements or compounds that occur naturally in the Earth s crust. Rocks are mixtures formed of minerals.