The Earth’s surface is not smooth, Identify on the map the highest highs

Hello I have Physical Geology Lab

[Figure 1 questions]

#1) The Earth’s surface is not smooth. Identify on the map the highest highs and the lowest lows. What geologic processes do you think causes these features?

#2) Which portions of the map contain the youngest and the oldest crust? Explain your answer

[Figure 2 questions] 

#3) How does the theory of plate tectonics explain the location of earthquakes and volcanoes? Where do most earthquakes and volcanoes occur? 

#4) Identify examples on the map where earthquakes and volcanoes occur in the interiors of plates. What might cause these earthquakes and volcanoes in the plate interiors?