The concentration of salt in seawater (its salinity) is about 35 parts per thousand; in other words, about 3.5% of the weight of seawater comes from the dissolved salts.

The world's highest waterfall is located in (B) Venezuela. The waterfall is named Angel Falls (Salto Ángel in Spanish), and it is situated in the Canaima National Park in the Gran Sabana region of Venezuela. Angel Falls is renowned for its impressive height, with a continuous drop of about 3,212 feet (979 meters) and a total height of 3,281 feet (1,000 meters).

New York City is known by many nicknames—such as “the City that Never Sleeps” or “Gotham”—but the most popular one is probably “the Big Apple.” How did this nickname come about? Although uses of the phrase are documented in the early 1900s, the term first became popular in the 1920s when John J.

Canada-United States Border. Stretching a massive 8,893 km, Canada and the United States share the longest border in the world.

The smallest continent is Australia. Therefore, the correct answer is (A) Australia. Australia is both a country and a continent, and it is often referred to as the "smallest continent" due to its relatively small landmass compared to other continents.

Brisbane is not a former capital of Australia. The other cities are all former capitals of their respective countries: 

Karachi: The capital of Pakistan from 1947 to 1959

Auckland: A former capital of New Zealand

Kyoto: A former capital of Japan

Brisbane was the capital of Australia before Canberra from 1842 to 1859.