What is an amorphous solid?
A. A solid made up of molecules arranged in a pattern
B. A solid with a regular, ordered crystal structure
C. A solid made up of conductive metallic bonds
D. A solid with no repeating pattern in its structure

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

i believe the answer is 5,000

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.