Final answer:
The statement is false; composite volcanoes tend to have more explosive eruptions compared to the gentler, effusive eruptions of shield volcanoes.
Step-by-step explanation:
The statement that composite volcanoes have relatively gentle eruptions when compared to shield volcanoes is false. Composite volcanoes, also known as stratovolcanoes, are characterized by steep profiles and periodic, explosive eruptions.
These eruptions can emit ash, lava, and volcanic gases with significant force, often causing pyroclastic flows which can be extremely destructive. On the other hand, shield volcanoes like those forming the Hawaiian Islands typically erupt in a more effusive manner, with lava flowing out gently and spreading in broad sheets that build up the flat, shield-like profiles characteristic of these volcanoes.