What makes up 71 of the earths crust

Related Answer. What is the percentage make up of most abundant element in the most abundant liquid of the earth's c Mention the percentage of carbon in earth's crust. The maximu, abudant elements in earth's crust is:.

The most abundant element in the earth's crust is:. Of the 20 key nonrenewable mineral resources it needs, what percentage does the U. Experts are particularly concerned about four strategic metal resources that are important for the U. What percentage does the U. This E-mail is already registered as a Premium Member with us.

Kindly login to access the content at no cost. This E-mail is already registered with us. Not my Question Bookmark. Flag Content. Do you notice the "tiny" bubble over Atlanta, Georgia? That one represents fresh water in all the lakes and rivers on the planet.

Most of the water people and life on earth need every day comes from these surface-water sources. The volume of this sphere is about 22, mi 3 93, km 3. The diameter of this sphere is about Yes, Lake Michigan looks way bigger than this sphere, but you have to try to imagine a bubble almost 35 miles high—whereas the average depth of Lake Michigan is less than feet 91 meters.

The vast majority of water on the Earth's surface, over 96 percent, is saline water in the oceans. The freshwater resources, such as water falling from the skies and moving into streams, rivers, lakes, and groundwater, provide people with the water they need every day to live. Water sitting on the surface of the Earth is easy to visualize, and your view of the water cycle might be that rainfall fills up the rivers and lakes.

But, the unseen water below our feet is critically important to life, also. How do you account for the flow in rivers after weeks without rain? In fact, how do you account for the water flowing down a driveway on a day when it didn't rain?

The answer is that there is more to our water supply than just surface water, there is also plenty of water beneath our feet. Even though you may only notice water on the Earth's surface, there is much more freshwater stored in the ground than there is in liquid form on the surface. In fact, some of the water you see flowing in rivers comes from seepage of groundwater into river beds.

Water from precipitation continually seeps into the ground to recharge aquifers , while at the same time water in the ground continually recharges rivers through seepage.

Humans are happy this happens because we make use of both kinds of water. In the United States in , we used about billion gallons 1, billion liters of surface water per day,and about Although surface water is used more to supply drinking water and to irrigate crops, groundwater is vital in that it not only helps to keep rivers and lakes full, it also provides water for people in places where visible water is scarce, such as in desert towns of the western United States.

Without groundwater, people would be sand-surfing in Palm Springs, California instead of playing golf. For a detailed explanation of where Earth's water is, look at the data table below. Notice how of the world's total water supply of about Of total freshwater, over 68 percent is locked up in ice and glaciers.

Another 30 percent of freshwater is in the ground. This is due to the prevalence of water on the planet's surface. While water itself is not blue, water gives off blue light upon reflection. For those of us confined to living on the surface, the fact that our world is mostly covered in water is a well known fact.

But how much of our planet is made up of water, exactly? Like most facts pertaining to our world, the answer is a little more complicated than you might think, and takes into account a number of different qualifications.

To break the numbers down, If you could melt all that ice, and the Earth's surface was perfectly smooth, the sea levels would rise to an altitude of 2.

Aside from the water that exists in ice form, there is also the staggering amount of water that exists beneath the Earth's surface. If you were to gather all the Earth's fresh water together as a single mass as shown in the image above it is estimated that it would measure some 1, million cubic kilometers km 3 in volume. Meanwhile, the amount of water that exists as groundwater, rivers, lakes, and streams would constitute just over Seen in this context, the limited and precious nature of freshwater becomes truly clear.

But how much of Earth is water—how much water contributes to the actual mass of the planet? This includes not just the surface of the Earth, but inside as well. Scientists calculate that the total mass of the oceans on Earth is 1. The origin of water on the Earth's surface, as well as the fact that it has more water than any other rocky planet in the Solar System, are two of long-standing mysteries concerning our planet.

Not that long ago, it was believed that our planet formed dry some 4. According to this theory, water was brought to the world's oceans thanks to icy comets, trans-Neptunian objects or water-rich meteoroids protoplanets from the outer reaches of the main asteroid belt colliding with the Earth. According to this new study, the world's oceans also date back 4. This conclusion was reached by examining meteorites thought to have formed at different times in the history of the Solar System.

Carbonaceous chondrite, the oldest meteorites that have been dated to the very earliest days of the Solar System, were found to have the same chemistry as those originating from protoplanets like Vesta. This includes a significance presence of water.