First of all, let's look at what the earth roughly ten thousand meters in a position, by today's science research, we can learn: the mean radius of the earth is about 6371 kilometers, the main is divided into three layers, from outside to inside, in order: the crust mantle (average thickness of about 17 km) - about 2865 km (thickness) - the earth's core. And the earth, ten thousand meters, that is, 10 km, from the data of the radius of the earth, it is only for the earth's surface, which is also within the scope of the crustal layers, so here should be a layer of granite under high temperature and high pressure.
Next we learn about the ten thousand metres of earth is composed of what material, today's mainstream view is generally believed that: the chemical composition of the upper crust is given priority to with oxygen, silicon, aluminum, and granite are similar, so called granite layer, also some people call it "sial". The distribution of the layer at the bottom of the ocean is very thin, and even appeared in the central Pacific is missing, so this layer belongs to the discontinuous envelops. Thought and theory: temperature and pressure in the earth's crust grows with the increase of depth, embodied in depth for every 100 meters deep, the temperature will rise 1 ℃. In recent years, the drilling results also show that for more than 3 km deep, for every 100 meters deep temperature 2.5 ℃, the temperature reached 200 ℃ to 11 kilometers. And the lower crust is rich in silicon and magnesium, similar to the basalt, therefore is called basalt layers, somebody also calls it "silicon magnesium layer", based on the distribution of the continents and oceans are the layer, belongs to the continuous circle.
So, we can determine the earth's ten thousand meters, belong to high temperature and high pressure environment, concrete material existence state remains to be proven.
These is my answer for your proposed the question, the hope can help you when you learn more about the earth.