The heat to drive Earth's convection cells comes from... A. the Earth's crust.

B. the Earth's mantle.

C. the Earth's core.

D. the sun.

Which of the following describes a situation where competition between producers exists

Draw a line graph showing the relationship between temperature in kelvin as a function of kinetic energy.

Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.