Question

1. Which of the following is true of oceanic plates?

Answer 1

Answer:

1 c. They are heavier than continental plates

2 a. in active volcanoes

3 b. valleys

Explanation:

1. The oceanic plates is more denser than the continental plates because of the kind of rocks that dominate the plate .  The oceanic plates contains more of Mafic rocks like basalt (Fe, Mg, Ca, low SiO2 ) that are heavier than the dominants rocks found in continental crust which are granitic (Na, K, Al, SiO2 )

2. Magma are usually a semi liquid or liquid rocks found underneath the earth .Magma's are usually found on the surface of the earth in a active volcanoes. When this magma flow on the surface of the earth it is called a lava.    

3 convergent plate movements is simply define as the collision or coming together of various plates of the earth. it can exist ;

• Between  collision of a continental plate and an oceanic plate ; This majorly  result to volcanoes. The heavier oceanic crust is usually subducted.
• Between collision of  continental plates ; This results to high land structures like mountain . The continental plates are less dense thereby leading to up-welling after collision.
• Between a collision of oceanic plates ; This result to volcanoes and high land structures like ridges.

Divergent plate margin usually create rift valley because of how the plates move away from each other.  

Answer 2

Underneath lakes and rivers pacfic ocean