The statement that the law of superimposition primarily applies to sedimentary rocks and lava flows is a correct statement.
Sedimentary rocks form on or around the surface of the globe, in contrast to metamorphic and igneous rocks, which are produced deep under the Earth. Sedimentary rocks are formed primarily by geological processes such as weathering, disintegration, precipitation, and lithification.
Erosion and weathering include the effects of wind and rain, that progressively break large stones into smaller ones. Because of erosion and weathering, boulder and even mountains turn into sediments like sand or mud. One kind of weathering is chemical weathering, often known as dissolution. This technique progressively removes stone by rinsing it in slightly acidic water. These three processes result in the components of new sedimentary rocks.
Therefore the statement is true.
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