Salary for Real Estate Brokers. Real estate brokers sell real estate for other individuals. They do this for a fee, also called a commission. Real estate brokers search other similar properties to compare prices and ensure the property is being listed at a competitive price. Brokers also monitor the fulfillment of the terms of the agreement once it is made and negotiate between buyers and sellers.
Oceanic crust is predominantly made of the rock basalt. Basalt is an extrusive igneous rock (meaning it forms once lava reaches the earth's surface... or ocean floor... and cools down). It is a dark colored, grey to black rock that has a lot of iron and magnesium in it, but not a lot of silicon.
On the other hand, continental crust remains where it is for billions of years and it is much older than oceanic crust. Composition of oceanic crust. Oceanic crust is made up of several layers with the topmost layer being just 500 meters thick. This is made up of basaltic rocks in the shape of pillows and sheets. The lower layer of oceanic crust is made up of two sub-layers that cover a thickness of 4.5 kilometers.