What brought about the Red Scare in American in 1919-1920 ? Americans feared the rise of communism in America

The Russians were threatening a nuclear attack on America.

The western states were experiencing a terrible drought.

Americans were worried because lawmakers wanted to remove the color red from our flag.

What is drought? what problem can cause?

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle