Final answer:
Shield volcanoes are formed by the eruption of low-viscosity, basaltic lavas. They have a low profile and expansive summit.
The statement 'they exhibit high profiles' is not true of shield volcanoes.
correct option is d
Step-by-step explanation:
Shield volcanoes are large, broad volcanoes that are formed by the eruption of low-viscosity, basaltic lavas. They typically have a low profile and expansive summit.
Options a, b, and c are all true of shield volcanoes. However, option d, 'they exhibit high profiles,' is not true. Shield volcanoes have a low profile, meaning they are not steep or tall.
Therefore, the correct answer is d.