The Hawaiian islands are composed What is the difference between the two types of igneous rocks?of linear chains of which of these types of volcano?

The question is incomplete. The complete question is  The Hawaiian Islands are composed of linear chains of which of these types of volcano?

A. Cinder cones  B. Shield volcanoes  C. Stratovolcanoes  D. Lava domes

Rock Types 5. What is the difference between the two types of igneous rocks?  A. The ages of the rocks. Intrusive rocks are always older  

B. Extrusive rocks were formed in water, intrusive rocks were not

C. Intrusive rocks were formed in water, extrusive rocks were not

D. Intrusive rocks were formed in the Earth, extrusive rocks were not

The answer to the first question is B (shield volcanoes) and the answer to the second question is D (Intrusive rocks were formed in the earth, extrusive rocks were not).  

Explanation:

4) A shield volcano is a type of volcano in which the molten magma (lava) has low viscosity-this means they move easily. A shield volcano can be characterized by shallow sloping sides i.e. the slope are not steep. The most notable of the volcano chain in the Hawaiian island is the Kilauea mountain because it is the most active of them all and has an height of 1247 meters.

5) The differences between intrusive igneous rock and extrusive igneous rock includes cooling time, rock formation, mineral proportions and crystal size and texture. Intrusive rocks are formed beneath the earth surface, they have bigger crystals, takes a long time to solidify and has a coarse texture while extrusive rocks solidifies within a shorter period compared to the intrusive rock, has a fine texture and is formed on the surface of the earth.  

A shield volcano is a wide volcano with shallowly-sloping sides. Shield volcanoes are formed by lava flows of low viscosity - lava that flows easily. ... The largest is Mauna Loa on the Big Island of Hawaii; all the volcanoes in the Hawaiian Islands are shield volcanoes.