Which group of people were the key to the communist revolution in the 1930's and 1940's?

Look at the photo i can’t do geography

How can minerals crystallize from materials dissolved in water? check all that apply.

Compare the quantity in column a with the quantity in column b. pa p a is tangent to the circle at a. column a column b ap a p ax a x question 4 options: the two quantities are equal. the quantity in column a is greater. the relationship cannot be determined from the information given. the quantity in column b is greater.