The four main Earth's system spheres are:
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Biosphere: This sphere includes all living organisms on Earth, as well as the ecosystems and environments they inhabit. It encompasses life forms from the deepest oceans to the highest mountains.
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Geosphere: This sphere consists of the solid Earth, including the crust, mantle, and core. It contains solid rock below and at Earth's surface, as well as soils and sediments.
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Hydrosphere: This sphere includes all water on Earth, in the form of oceans, rivers, lakes, groundwater, and ice. It encompasses water in all its states (liquid, solid, and gas).
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Atmosphere: This sphere is the layer of gases surrounding the Earth, consisting of nitrogen, oxygen, carbon dioxide, and other gases. It also includes weather and climate patterns.
Based on your question, the geosphere is the sphere that contains solid rock below and at Earth's surface.