How many things can you think of that are made of plastic? Why is plastic so common?

How does cloud cover affect how much infrared light is reflected back to the ground?

After world war i, how did the allied countries hope to keep germany from becoming too powerful again? question 5 options: united states took over german military bases. germany was not allowed to have a large army or navy. germany was allowed to keep its colonies. germany did not have to pay any war debts to the allied countries.

Who gave the famous "i have a dream" speech at the march on washington?