Approximately 70.8% (about 71%) of the Earth's surface is covered by oceans and seas, containing approximately 96.5% of all Earth's water. Continents and islands account for the remaining approximately 29.2% (about 29%).

In hydrology and meteorology:
Drizzle is defined as fine, uniform precipitation composed exclusively of minute water droplets with diameters less than 0.5 mm.
Due to the extremely small droplet size and slow terminal fall velocity, drizzle intensity is typically less than 1 mm/h (light drizzle is $\lt 0.25\text{ mm/h}$, moderate is $0.25 - 0.50\text{ mm/h}$, and heavy drizzle rarely exceeds $0.75 - 1.0\text{ mm/h}$).
Rain droplets, by contrast, have diameters $\gt 0.5\text{ mm}$ and rainfall intensities generally exceeding $1\text{ mm/h}$.

In groundwater hydrology and hydrogeology:
Statement (A) is correct: The porosity (\(n\)) of an aquifer material depends on packing arrangement, particle shape, and grain sorting (degree of assortment). Poorly sorted soils have lower porosity because fine particles fill void spaces.
Statement (B) is incorrect: For uniform spherical particles, cubic packing yields the maximum porosity (\(n = 47.64\%\)), whereas rhombohedral (close-packed) arrangement yields the \lt strong\gt minimum porosity\lt /strong\gt (\(n = 25.95\%\)).
Statement (C) is correct: Transmissivity (\(T = K \times b\), where \(K\) is hydraulic conductivity in \(\text{m}/\text{day}\) and \(b\) is aquifer thickness in \(\text{m}\)) is expressed in \(\text{m}^2/\text{day}\).