Oceanography and Hydrology

Approximately 71% of Earth's surface is covered by water, including oceans, seas, lakes, and rivers. This is a fundamental fact in geography - the Pacific Ocean alone covers about 30% of Earth's surface. The remaining 29% is land mass across seven continents.

The Dead Sea has the highest salinity at approximately 34% salt content, nearly 10 times saltier than ocean water (3.5%). This extreme salarity is due to high evaporation rates in the Rift Valley and minimal outflow. The Red Sea is also very saline (4%) but less than the Dead Sea. The Black Sea has lower salinity (1.8%) due to freshwater influx, and the Mediterranean Sea is moderately saline (3.8%).

Tides are the periodic rise and fall of sea water levels caused primarily by the gravitational pull of the moon and secondarily by the sun. Option A describes ocean currents, B describes thermohaline circulation, and D describes cyclonic systems - none of which are tides.

In wave mechanics, fetch (the distance wind blows over open water) and wind speed directly determine wave size and energy: longer fetch and higher wind speeds create larger waves with more energy. This fundamental principle of oceanography explains how storms generate massive swells.

Tides embody multiple energy forms: gravitational potential energy from lunar/solar gravitational forces, kinetic energy from water movement, and hydraulic energy from water displacement. The moon's gravity primarily drives tidal cycles.

In clear ocean water, sunlight can penetrate to approximately 240 feet (about 73 meters). Beyond this depth, water absorption and scattering prevent significant light transmission, creating the darkness of the deep ocean zone.

The Scandinavian coasts have many raised sea beaches which lie from 8 metres to 30 metres above present day sea level. These are evidence of post-glacial rebound - the land rising after the weight of ice sheets melted. The exact measurements vary, but 8-30 metres is the commonly cited range in geographical studies.

The average salinity of seawater is approximately 3.5% (35 parts per thousand). This means about 35 grams of dissolved salts per kilogram of seawater, primarily sodium chloride.

The average salinity of seawater is 3.5% (35 parts per thousand). This is a standard oceanographic fact. Salinity varies slightly by region (higher in enclosed seas, lower near river mouths), but 3.5% is the accepted global average.

Wave formation follows basic physics: stronger winds blowing over greater distances (fetch) create larger waves with more energy. The energy in waves is proportional to the square of their height, so larger waves carry significantly more energy. (Note: question has typos 'enerty' and 'prosses')

This is a wordplay riddle about the word 'water'. The letter 'T' appears between 'wa' and 'er' in 'w-a-t-e-r', so it's literally 'in the middle of water'. Think of 'wa' + 'er' = water, with 'T' between them - making T the island surrounded by water.

Accrue means to come to one as a gain, accumulate, or increase over time - often used with interest, benefits, or advantages. Option C is correct. The other options are incorrect: 'support for statue' is a pedestal, 'long wave' is a swell, and 'number of points' is a score.