Option 1 states that stratovolcanoes produce lava flows that initially follow valleys but are highly resistant to erosion. This statement is correct. Stratovolcanoes, also known as composite volcanoes, have steep sides and produce viscous lava that can flow down existing valleys or form new valleys. The lava from stratovolcanoes can be highly resistant to erosion due to its composition and consistency.

Option 2 states that the surrounding areas can remain highlands, lava ridges, or mesas. This statement is also correct. When a volcano erupts, it can deposit lava and volcanic debris around its base, forming highlands, ridges, or mesas. These landforms are often distinct from their surroundings and are a result of volcanic activity.

Option 3 states that Hawaiian shield volcanoes are eroded by streams that form deeply carved valleys with steeply sloping heads. This statement is correct. Shield volcanoes, like those found in Hawaii, are formed by the accumulation of fluid lava flows. Over time, these volcanoes can be eroded by streams, which carve deeply carved valleys with steep slopes at the heads.

Option 4 states that the system of streams on a dissected volcano cone is not a radial drainage pattern. This statement is incorrect