What type of system represents the cycling of energy on the earth?

A. Mixed System

B. Open System

C. Closed System

D. Energy System

Which pricnipal energy level contains only s and p sublevels?

Some types of cancers are treated with radation, similar to ultraviolet light

Why is the earth blue

Why does water sink in polar regions? A. Evaporation due to strong wind creates gyres. B. Water gets colder and saltier there, increasing its density. C. Southern Oscillation currents force water down as they strike land. D.

What type of landforms will result from the plate movement shown in the diagram?

Which of the following choices is a goal of sustainable practices? A. They focus on using resources for maximum productivity. B. They focus on using resources that can disappear if overused. C. They focus on using resources that can be renewed. D.

Why are atoms so important?

Which of the following is the best example of homeostasis in the human body? and why?

Dna determines the structure of proteins produce by cells?

What does a organism that is still has many cells produce spores and gets food from the enviroment