when astronomers carefully examine the planets found by kepler and draw conclusions from the kepler sample, what do they conclude about planets the size of earth?

These are my revision notes for plate boundaries. The third explains your question. The two plates converge and as they meet, the force causes fold mountains to form. The most dense plate boundary (oceanic crust) will subduct (go under) the other. This is called a deep sea trench. The crust that goes under will carry some water from the ocean with it and this will make the magma less dense when it melts under found. Therefore, it will rise up and find weaknesses in the fold mountains and form very steamy volcanoes.

Features: fold mountains, deep sea trench.