Given the question: Q: What substance comes toward earth's crust through mantle plumes? Read this paragraph and choose the correct option from the provided answers: Some volcanoes form over active hot spots . Scientists count about 50 hot spots on the Earth. Hot spots may be in the middle of a tectonic plate. Hot spots lie directly above a column of hot rock called a mantle plume . Mantle plumes continuously bring magma up from the mantle towards the crust ( Figure below ). Choices: - rocks - water - gas - magma A:
The answer is:
magma