About ___% of Earths land surface is covered by sedimentary rocks.

The correct answer is 75%. Sedimentary rocks, which are formed from the accumulation and compaction of sediments, cover approximately 75% of the Earth's land surface. These rocks are crucial for understanding Earth's history, climate, and past life forms, often containing fossils.

• 50%, 65%, and 85% are incorrect percentages. While sedimentary rocks cover a vast area of the land surface, they constitute a much smaller percentage (about 5%) of the Earth's crust by volume, as igneous and metamorphic rocks make up the bulk of the crust.