now lets investigate how these plates are moving.

part b - plate movement shown in a hypothetical plate map

refer to the hypothetical plate map below and determine the relative motion of the plates. place the arrows on the map to indicate the correct direction of plate movement. each arrow can only be used once.

drag the appropriate labels to their respective targets.

Question

now lets investigate how these plates are moving.

part b - plate movement shown in a hypothetical plate map

refer to the hypothetical plate map below and determine the relative motion of the plates. place the arrows on the map to indicate the correct direction of plate movement. each arrow can only be used once.

drag the appropriate labels to their respective targets.

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "direct_cot", "explain_then_answer", "tutor" ], "needs_drawing": false, "concepts_used": [ "Plate Boundary Characteristics" ], "new_concepts": [ "Oceanic Ridge Dynamics", "Subduction Zone Motion" ], "current_concepts": [ "Plate Boundary Characteristics", "Oceanic Ridge Dynamics", "Subduction Zone Motion" ] } ## Identify plate boundary types The map shows two main types of plate boundaries: 1. **Oceanic ridges** (marked by double lines with perpendicular ticks): These are divergent boundaries where plates move apart. 2. **Subduction zones** (marked by lines with triangles/teeth): These are convergent boundaries where one plate sinks beneath another. The teeth point toward the overriding plate. ## Analyze the central triple junction The three oceanic ridge segments meet at a central triple junction. - The vertical ridge segment separates the northwest plate and the northeast plate. Since it is a divergent boundary, the northwest plate must move west/northwest, and the northeast plate must move east/northeast. - The southwest-trending ridge separates the northwest plate and the southern plate. This means the northwest plate moves away from this ridge (towards the northwest), and the southern plate moves away from it (towards the southeast). - The southeast-trending ridge separates the northeast plate and the southern plate. This means the northeast plate moves away from this ridge (towards the northeast), and the southern plate moves away from it (towards the southwest). ## Determine directions for each target box Let's analyze the motion of each plate region containing a target box: 1. **Far-left target (Northwest Plate)**: - This plate is bounded by a subduction zone on its left (west) side, with teeth pointing northwest (indicating it is subducting to the northwest under an overriding plate, or converging). - More directly, it is to the left of the vertical divergent ridge. - Therefore, this plate must be moving towards the west/northwest. - Looking at the available arrows: - Arrow 4 points up-right (northeast). - Arrow 3 points up-left (northwest). - Arrow 1 points down-right (southeast). - Arrow 2 points down-left (southwest). - Arrow 5 points down (south). - The arrow pointing northwest is **Arrow 3**. 2. **Far-right target (Northeast Plate)**: - This plate is to the right of the vertical divergent ridge. - Therefore, it must be moving towards the east/northeast. - The arrow pointing northeast is **Arrow 4**. 3. **Middle-left target (Northwest Plate near the ridge)**: - This target lies on the northwest plate, just left of the vertical ridge. - Since the entire northwest plate moves northwest, this target must also contain the northwest-pointing arrow, which is **Arrow 3**. 4. **Middle-right target (Northeast Plate near the ridge)**: - This target lies on the northeast plate, just right of the vertical ridge. - Since the entire northeast plate moves northeast, this target must also contain the northeast-pointing arrow, which is **Arrow 4**. 5. **Bottom target (Southern Plate)**: - This plate lies south of both the southwest-trending and southeast-trending ridges. - Divergence at these ridges means the southern plate must move generally southward. - The arrow pointing straight down is **Arrow 5**. ## Match arrows to targets Let's define the five target boxes by their positions on the map: - **Top-left box** (on the northwest plate): **Arrow 3** (pointing northwest) - **Top-right box** (on the northeast plate): **Arrow 4** (pointing northeast) - **Middle-left box** (just left of the vertical ridge): **Arrow 2** (pointing southwest) or **Arrow 3** (pointing northwest). Let's re-verify the relative motion perpendicular to the ridges: - The southwest-trending ridge is oriented at roughly a $45^\circ$ angle (from bottom-left to top-right). The spreading direction perpendicular to this ridge is northwest/southeast. Thus, the northwest plate moves northwest (**Arrow 3**), and the southern plate moves southeast (**Arrow 1**). - The southeast-trending ridge is oriented at roughly a $135^\circ$ angle (from top-left to bottom-right). The spreading direction perpendicular to this ridge is northeast/southwest. Thus, the northeast plate moves northeast (**Arrow 4**), and the southern plate moves southwest (**Arrow 2**). - The vertical ridge spreads east-west. - Let's look at the subduction zone on the left: the teeth point northwest, meaning the plate to the southeast is subducting under the plate to the northwest. This is consistent with the northwest plate moving northwest. - Let's look at the subduction zone on the right: the teeth point west/southwest, meaning the plate to the east is subducting. - Let's match the five arrows to the five boxes: - **Top-left box**: **Arrow 3** (Northwest) - **Top-right box**: **Arrow 4** (Northeast) - **Middle-left box**: **Arrow 2** (Southwest) - representing the motion of the plate on the left side of the vertical ridge, or **Arrow 3**? Since the vertical ridge spreads east-west, the plate to its left moves west/northwest. Thus, the middle-left box is **Arrow 3** (Northwest) or **Arrow 2** (Southwest). - Let's look at the arrows again: - Arrow 1: Southeast ($\searrow$) - Arrow 2: Southwest ($\swarrow$) - Arrow 3: Northwest ($ warrow$) - Arrow 4: Northeast ($ earrow$) - Arrow 5: South ($\downarrow$) - At a divergent boundary, plates move directly away from the ridge axis. - For the vertical ridge: The plate to the left moves West. The plate to the right moves East. - For the southwest-trending ridge (oriented at $45^\circ$): The plate to the northwest moves Northwest ($ warrow$, **Arrow 3**). The plate to the southeast moves Southeast ($\searrow$, **Arrow 1**). - For the southeast-trending ridge (oriented at $135^\circ$): The plate to the northeast moves Northeast ($ earrow$, **Arrow 4**). The plate to the southwest moves Southwest ($\swarrow$, **Arrow 2**). - Therefore: - The northwest plate moves northwest: **Arrow 3** ($ warrow$). - The northeast plate moves northeast: **Arrow 4** ($ earrow$). - The southern plate moves south: **Arrow 5** ($\downarrow$). - The middle-left box (on the northwest plate, near the vertical ridge): **Arrow 2** ($\swarrow$) or **Arrow 3** ($ warrow$). Since the vertical ridge spreads east-west, the motion is primarily westward. Combined with the southwest ridge, the motion is northwest (**Arrow 3**). - The middle-right box (on the northeast plate, near the vertical ridge): **Arrow 1** ($\searrow$) or **Arrow 4** ($ earrow$). - Let's re-evaluate the five boxes: 1. **Top-left box** (on the land/plate to the far left): **Arrow 3** ($ warrow$) 2. **Top-right box** (on the land/plate to the far right): **Arrow 4** ($ earrow$) 3. **Middle-left box** (left of the vertical ridge): **Arrow 2** ($\swarrow$) 4. **Middle-right box** (right of the vertical ridge): **Arrow 1** ($\searrow$) 5. **Bottom box** (on the southern island/plate): **Arrow 5** ($\downarrow$) - Let's check if this is consistent: - If middle-left is **Arrow 2** ($\swarrow$) and middle-right is **Arrow 1** ($\searrow$), they diverge from the vertical ridge (moving away from each other). - If top-left is **Arrow 3** ($ warrow$) and top-right is **Arrow 4** ($ earrow$), they also diverge from the vertical ridge. - The southern plate moves straight down (**Arrow 5**), diverging from both southern ridges. - This set uses all 5 arrows exactly once: Arrow 1, Arrow 2, Arrow 3, Arrow 4, Arrow 5. This perfectly matches the constraint "Each arrow can only be used once." Based on the behavior of divergent oceanic ridges (where plates move directly away from the ridge axis) and convergent subduction zones, the correct placement of the arrows into the five target boxes is as follows: - **Top-left box** (on the far-left plate): **Arrow 3** ($ warrow$) - **Top-right box** (on the far-right plate): **Arrow 4** ($ earrow$) - **Middle-left box** (left of the vertical ridge): **Arrow 2** ($\swarrow$) - **Middle-right box** (right of the vertical ridge): **Arrow 1** ($\searrow$) - **Bottom box** (on the southern island plate): **Arrow 5** ($\downarrow$) { "subject": "Natural Science", "question_type": "Fill-in-the-blank", "knowledge_point": [ "Natural Science", "Geology", "Plate Tectonics" ] }

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QUESTION IMAGE

Question

Explanation:

Identify plate boundary types

Analyze the central triple junction

Determine directions for each target box

Match arrows to targets

Answer: