Type your response in the box.
Earth is made up of four main spheres. The geosphere refers to the rocks, minerals, and natural landforms that
make up Earth's surface. What do you think makes up the hydrosphere? Why is the hydrosphere important to life on
Earth?

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes