What % of Earth’s population lives within 100km or 62mi of a coastline? What % o

Question

What % of Earth’s population lives within 100km or 62mi of a coastline?

What % of the U.S. population lives in a coastal area?

What is the average salinity of Earth’s oceans? In what areas is it slightly higher and why?

To what areas does a shoreline or littoral zone extend?

What is the physical geography definition of a beach?

Most beach sand (the light colored type) is what of what?

Some beaches in Hawaii and Iceland have what color sand?

Sea level change:

Sea levels were about how much lower 18,000 years ago at the end of the last glaciation period?

Average sea level rise has been what in the last 100 years?

How would high population, coastal areas of the US and world be affected with sea level rise?

Explanation / Answer

1. Presently 40% of the Earth’s population lives within 100km or 62mi of a coastline.

2. Presently 39% of the U.S. population lives in a coastal area

3. Salinity is a measure of how much salt is dissolved in water. The average salinity of seawater for all Earth's oceans is about 35 grams of dissolved salts per kilogram of seawater. The salanity of some palces are higher than other because there hardly any rain falls but warm dry winds cause lots of evaporation. Due to evaporation water vapour rises into the atmosphere, leaving the salt behind and thus the salinity of the seawater increases.

4. The littoral zone is the part of a sea, lake or river that is close to the shore. The littoral zone extends from the high water mark to shoreline areas that are permanently submerged.

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