Final answer:
The IWU details from the text that best support the formation of magma in relation to tectonic plates are in option B, where it mentions the formation of magma at places where plates are pulled apart or pushed together, and the presence of volcanoes away from plate boundaries.
Step-by-step explanation:
To address the student's question of which IWU details from the text best support the answer to Part A, we should look for the details that most directly relate to the formation of magma and volcanic activity as it pertains to tectonic plates and mantle processes. Key information about the formation of molten rock or magma and its relation to plate boundaries is essential in understanding the geological phenomena described.
Option A mentions that "The rock inside the planet we live on can melt to form molten rock called magma. This magma is lighter than the rocks around it and so it rises upwards." This supports the notion of magma formation, but does not provide the context of tectonic plates.
Option B expands on the relationship between magma and plate boundaries, highlighting that "Magma and volcanoes often form where the plates are pulled apart or pushed together but we also find some volcanoes in the middle of tectonic plates." This detail aligns with the information provided about the melting of rock at diverging and converging plate boundaries, and the existence of hot spots away from plate boundaries.
Option C addresses the different shapes and sizes of volcanoes, which, while informative, does not specifically discuss the formation of magma. Option D uses an analogy to explain the viscosity of magma but does not link to tectonic activities. Finally, option E continues the analogy from D and does not provide the specific geological context required for the IWU details.
Therefore, the best IWU details from the text that support the formation of magma due to tectonic activities are found in option B, as it explicitly discusses the formation of magma in relation to plate tectonics.