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.
Making the world better, one answer at a time. Its made up of both. Oceanic crust is mostly mafic magma (basalt) and continental crust is mafic and felsic. The lithosphere also contains the upper portion of the upper mantle which is mostly mafic. The earths crust is 60% Si02 (silicates). Felsic rocks are much more silicate heavy than mafic. So one would assume that the crust is more felsic than mafic. That's just my conceptual thought process so don't take me on my word.