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The correct sequence of the given continents in the decreasing order of their percentage of Earth`s land is Africa-North America-South America-Europe.
Africa is the continent with the highest percentage of land area on Earth. It is known for its vast savannahs, deserts, and diverse landscapes. North America is the second-largest continent in terms of land area, including countries like the United States, Canada, and Mexico. South America is the third-largest continent, known for its Amazon rainforest, Andes Mountains, and diverse ecosystems. Europe, while geographically small compared to the other continents, still has a significant land area and is home to numerous countries with rich histories and cultures.
Therefore, the correct sequence is Africa-North America-South America-Europe based on the decreasing order of their land percentages.