Currently, the concentration of carbon dioxide in Earth's atmosphere is about 400 parts per million. During the Cretaceous Period, about 110 million years ago, the concentration of carbon dioxide in Earth's atmosphere was about 2,000 parts per million. Based on your knowledge of the greenhouse effect, how do you think the average temperature on Earth 110 million years ago compared to the temperature in modern times?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

If forces acting on an object are unbalanced. true or false