Why do we devide the eastern hemisphere from the western

What do geologists use to mark divisions in geologic time

Now that we are aware that asteroids cross Earth's orbit, detecting them has become important. Why are they so difficult to detect if they are crossing Earth's orbit? a. They are relatively far away. b. They are not very reflective. c.

Why did the ancient Chinese believe that they were the center of the universe? O The arrival of traders from other lands made them an important civilization. O The people of ancient China lacked a basic education in world geography.

What is bigger 1/2 or 1/4

What is the afforestation?

What are the major controlling factors for the variations of the water mass in the ocean?

The climatic effect that influences precipitation and air flow locally is

Does oceanwater contain any other minerals than salt

What comes to bedsides icy bridges battlefronts and crumbling bridges?

How did the black death affect medieval Europe