Why do geologists think Earth's core contains mostly iron? A. The crust also contains mostly iron.
B. The entire core is a solid mass.
C. Iron is the lightest element.
D. Comets contain more iron than Earth's crust does.

Which table best shows the impacts resulting from human activity? impact of human activities human activity impact forest area cleared to construct an airport increase in oxygen level vegetation cleared to construct an oil mine increase in pollution impact of human activities human activity impact forest area cleared to construct an airport increase in sound pollution vegetation cleared to construct a power plant contamination of water impact of human activities human activity impact beehives cleared from urban areas increase in vegetation dams constructed on a river increase in fish population impact of human activities human activity impact beehives cleared from urban areas increase in bird population dams constructed on a river better quality of water

Does the sun release radiant energy?

Nucleic acid certain protein cell membranes certain carbohydrates