Type the correct answer in the box. is the use of reliable knowledge for a practical purpose.
is the study of the natural world through observation and experimentation

Which of these statements is correct about plastic and concrete? a) both plastic and concrete are minerals because they are natural, solid materials. b) both plastic and concrete are not minerals because they are made by humans. c) plastic is a mineral because it has a definite crystal structure but concrete is not a mineral because it is organic. d) plastic is not a mineral because it is not formed under the ground but concrete is a mineral because it has a definite composition.