Which best describes how igneous rocks are formed?

a.
layers of dirt and other rocks are pressed together to form igneous rocks.

b.
molten material in the earth cools and hardens to form igneous rocks.

c.
elements in the earth form igneous solids with crystals.

d.
wind erodes mountains into small igneous rocks.

Match the types of competition to their descriptions.

Rue or false siblings look simila rbecause they each have some traits of their parents.

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