Which of the following affects the surfaces of historical buildings made out of sandstone or limestone, and causes a reaction that forms a powdery substance that can be washed away by rain?
coal dustsulfur pollutantsvolcanic ashnone of these were mentioned in the reading

What is the famous rainforest in costa rica called?

Look at the data above. provide an explanation for europe’s projected population decrease by the year 2050. (i'm doing this for future kids) the answer is : the percentage of people over the age of 65 and under the age of 15 in europe is currently the same at 16% each. therefore, the majority of the population is between the ages of 16 and 64. in forty years from now, in 2050, a greater percentage of the population will be over the age of 65. europe also has a relatively long life expectancy of 75 years. this, combined with a low birth rate means that by 2050 europe’s population will actually be less than it is today.

The net below can be folded to form a square pyramid. la2419"100what is the surface area of the pyramid? 190.8 square inches| 0 217.8 square inches300. 6 square inches354.6 square inches