Approximately 97.5% of the earths water is salt water (saline), and 2.5% is fresh water hope this helps.
It depends on what you're asking. If angle a and b are both on a straight line, b would equal 169 degrees because the total has to add up to 180 degrees, but if they are on a right angle, b would equal 79 because it has to add up to 90 degrees.
The greenhouse gas carbon dioxide helps to D. <span> maintain warmth near Earth’s surface. This phenomenon is called global warming as part of the climate change experienced by the Earth. Greenhouse gases are trapped in the atmosphere which traps the heat that is released near the surface</span>
A very important feature in partly in the Sub-Sahara of Africa is the Great Rift Valley which stretches for about 6000km from Syria to Mozambique is a block faulted valley, 30 to 60 miles wide which represents a rift in the African plate of plate tectonics, similar to the ones under the ocean like the mid-Atlantic ridge. It has fertile soil in it, partly from volcanoes like Mt Killimanjaro, and also many large lakes like Lake Tanganyika, It provided a rich environment due to the soil and the lakes for example, for the Bantu people in the past, many of which had their kingdoms here. Ancient human remains have been found in it's soil by Richard Leakey.
