Land, Soil, Water, Natural Vegetation and Wildlife Resources

While the Earth is covered in water, only about 2.5% to 3% is fresh water, and of that, only a very small fraction (often cited as around 1%) is easily accessible for human use in rivers, lakes, and accessible groundwater.

Poaching is the illegal hunting or capturing of wild animals, which is a major driver of species extinction. While hunting and killing are general terms, poaching specifically refers to the illegal, often commercial, act that threatens biodiversity.

The biosphere is the global sum of all ecosystems, representing the zone of life on Earth. It includes all living organisms and their interactions with the lithosphere, hydrosphere, and atmosphere.

A national park is a protected area established by a government to conserve the natural environment and its biodiversity. Other options like forest or wildlife park are broader categories that do not necessarily imply the same level of legal protection for ecological integrity.

Humus is the dark, organic material that forms in soil when plant and animal matter decays. It is rich in nutrients and is typically found in the top layer of soil.

Soil formation is influenced by parent rock, climate, relief, time, and flora/fauna. Fossils are remnants of ancient life found in sedimentary rocks but are not a primary factor in the process of soil formation.

Deciduous forests are characterized by trees that shed their leaves annually during a specific season, usually to conserve water during dry or cold periods. Evergreen trees keep their leaves throughout the year.

Approximately 71 percent of the Earth's surface is covered by water, which is commonly rounded to 3/4 in general geography contexts. The other options significantly underestimate or overestimate this coverage.

Soil conservation involves practices to prevent soil erosion and degradation. Mulching, rock dams, and shelter belts are all recognized methods, whereas deforestation removes vegetation cover and accelerates soil erosion.

The Earth's surface is roughly 71 percent water and 29 percent land. Therefore, 30 percent is the closest approximation among the provided choices.