Activity 3.head on collision part c. answers


Activity 3 Head on collision

•Trenches will form
•Volcanoes will form at the surface of plate A
• Earthquakes can happen
•Plate B undergoes subduction process

Q22. Volcanoes might form at the surface of plate A.
Q23. Tsunami is formed at the surface of the sea.

In science 10 unit 1 module 1 activity 3 , the title of the activity is " Head-On Collision". This activity is divided into three part. Part A: Converging Continental plate and Oceanic plate. Part B: Convergence of two oceanic plates. Part C: Two continental plates convergence. This activity shows the different geological features formed in three different type of converging plate. It also explains the formation of geological feature in each type of converging plate.

Part A: Converging Continental plate and Oceanic plate

Here are the answers to the question presented in Part A


Plate A is oceanic plate while plate B is continental plate. Plate A is oceanic plate since it is denser than plate B in which denser oceanic plate will subduct beneath continental plate when they collide as shown in the figure.

Q.16 answer

As plate A collides with plate B, plate A bends downward beneath plate B since it is denser compared to plate B. We called this bending of plate A as subduction process.

Q.17 answer

As plate A continues to move downwards going to the mantle. The leading edge of plate A will melt and turns into magma. Magma rise up to the surface to form volcanoes.

Q.18 answer

The molten material produce as the leading edge plate A melts is known as Magma.

Q.19 answer

Magma rise up on top of plate b to form volcanoes.

Q.20 answer

As the two plates continue to grind between each other, the geological feature will forms is earthquake.

Part B: Convergence of two oceanic plates

Here are the answers to the question presented in Part B

Q21. answer

The geological process occur are: volcanoes, trench, volcanic island, and under water earthquake.

Q.22. answer

Volcanoes will form over the surface of Plate A.

Q.23. answer

Tsunami or harbor wave will form at the surface of the ocean.

Part C: Two continental plates convergence.

Here are the answers to the question presented in Part C

Q.24. answer

The strips of clay buckled upward

Q.25. answer

Mountains are formed in the lithosphere

Q.26. answer

Shallow earthquake will occur due to the collision of the two plates

Q.27. answer

Since the two plates collides are both continental plates which are both less dense, no subduction process happen and no formation of volcanoes and trench. Only mountain ranges and earthquake will formed in this type of converging plate.

To know more about the convergent boundary, visit the link provided:

Three types of Convergent boundary

Continental to oceanic convergence

Oceanic to oceanic convergence

Continental to continental convergence

Continental to oceanic convergence

Oceanic plate will subduct beneath the continental plate since it is more denser. Several geological features will formed because of this convergence. Philippine Islands are also a product of continental to oceanic plate convergence, wherein Eurasian plate collides with Philippine sea plate which produces volcanic islands creating Philippines Island.

Oceanic to oceanic convergence

The geological features formed in this convergence is similar to continental oceanic convergence.

Continental to continental convergence

This type of collision will not produce a trench and volcanoes, but it produces mountain ranges and earthquake. Earthquake will occur in all type of converging plates.

Here are the list of geological feature when two oceanic plate converged



Volcanoes or volcanic island



Grinding of the two oceanic plate as they collide produces earthquake. The type of earthquake produce is tectonic earthquake since its origin is the movement of the plate. When earthquake is produce because of Volcanic activity, we called them as Volcanic earthquake.


During the subduction of oceanic plate B beneath oceanic plate A, it produces and depression on the ocean floor which is deeper than the other. We also called them as submarine valleys.


As the leading edge of plate B, it will dive into the mantle and melts. When the leading edge of the plates melts, it turns into a magma which rise up on the surface creating volcanoes.

Convergent boundary is also known as destructive boundary. As the subducted plate reaches the mantle, it will be destroyed. This type of boundary also explains most of the rock cycle. The plate will move in a certain direction because of the convection current of the mantle. Convection current in the mantle are produce because of heat in the inner core caused by radioactive decay of uranium which releases tremendous amount of heat.

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It can be the oceanic plate(plate A) and continental plate(plate B). When the two plates bump each other or collides, it creates a high form of land like mountain range or other high type of land. It merges to create another form of land.

Do you know the answer?

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