Avolcanic eruption takes place in a location. lava flows down the volcano into human habitation. it blocks the flow of a river and makes it change its path. which earth systems interact during this process?

geosphere, biosphere, hydrosphere

Geosphere is a part of the Earth's, which lies below the lithosphere or earth crust. It includes solid parts like mantle and crust. The hydrosphere is a reserve of water lies above the Earth's crust. Biosphere is the part of earth which lies above the earth crust. It includes the habitat of all the living species on the earth.

In the given situation, the volcanic eruption is the product of the geological activity which involves the geosphere. The lava from the volcanic eruption is affecting the human habitation which is included in the biosphere. And, lastly it is flowing in the river and causing the change in it's path, hence affected the  hydrosphere.

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