You are an AI assistant. User will you give you a task. Your goal is to complete the task as faithfully as you can. While performing the task think step-by-step and justify your steps.
system
Heat supplies the energy that causes motion. The deeper you go into toward the Earths core, the hotter it gets. At the core it is really hot. All that heat tries to rise toward the surface. In the Mantle, the rock is partially melted and is able to move. As it is heated, the material in the mantle moves toward the surface. As the mantle material rises, it cools. When it reaches the Earths crust, it is mostly stopped. A little of the material can break through the surface, but not all. Instead, it begins to move horizontally. The mantle material moves horizontally away from a mid-ocean ridge crest. Toward the surface, the mantle material starts to cool. As it cools it sinks back down into the mantle. These areas are where deep sea trench occur. The material sinks back down to the core. The system operates like a giant conveyor belt. The motion due to heating and cooling is called convection. 

Question: "Why does the material move horizontally?"

Response: "Because it cannot break through the surface"

Does the response correctly answer the question?
user
No, the response does not completely and accurately answer the question. The response should be:

"The material moves horizontally because, after rising to the Earth's crust where it is mostly stopped, it has nowhere else to go but to move sideways, driven by the continuous flow of more heated material rising from below. It moves away from the mid-ocean ridge crest and eventually cools, forming a convection current that drives the movement of tectonic plates."
assistant
If the mantle material moves horizontally when it encounters the Earth's crust, what would happen to tectonic plates if convection currents within the mantle were to significantly increase in speed?
user
If convection currents within the Earth's mantle were to significantly increase in speed, the effect would have notable implications for tectonic plates. Here's a step-by-step reasoning of what could potentially occur:

1. Increased Speed of Mantle Convection: Convection currents are created by the heat from the core that causes mantle material to expand, become less dense, and rise toward the crust. If these currents were to increase in speed, it would mean that the process of heating, rising, and spreading beneath the plates would be occurring at a faster rate.

2. Enhanced Movement of Tectonic Plates: Since mantle convection is a driving force behind the movement of tectonic plates, an increase in the speed of mantle convection would likely result in an increase in the speed at which the tectonic plates move.

3. Increased Geological Activity: Faster tectonic plate movements would probably lead to more frequent and potentially more intense geological activity, such as earthquakes and volcanic eruptions. This happens as plates interact more aggressively at their boundaries – divergent, convergent, and transform.

4. Alteration of Plate Boundaries: The increased rate of plate movement could also change the dynamics at plate boundaries, potentially creating new rift zones, subduction zones, and transform faults. These changes would reshape the geography of the oceans and continents over geological timescales.

5. Changes in Sea-Floor Spreading: At mid-ocean ridges, where new crust is formed as plates diverge, an increase in convection current speed could result in more rapid sea-floor spreading, which could widen the oceans and push continents further apart.

6. Impact on Climate and Sea Levels: The reshaping of continents and oceans could have profound effects on global climate patterns and sea levels. For example, changes in sea-floor spreading could change oceanic currents, which play a critical role in regulating the Earth's climate.

In summary, a significant increase in the speed of mantle convection currents would lead to a more active and dynamic Earth surface, characterized by faster plate movements, increased geological hazards, changed sea-floor spreading rates, and long-term alterations to the Earth's topography. However, such drastic changes in convection speed would require a significant change in the heat output from the Earth's core, which is not seen in the geological and historical record.
assistant