Which two of the following sentences from the article include central ideas of the article?

Over long periods of time – millions and millions of years – all rocks play a part in Earth's recycling system.
Magma that intrudes or pushes itself into layers and cracks of existing rocks underground forms intrusive igneous rocks, like granite.
The only parts of the rock cycle that we can easily observe are the surface processes that break down rocks, called erosion, and that build up rocks, called deposition.
There are many types of landslides, but they all involve large amounts of moving rocks.

Yes, it’s awesome
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The reason why i feel that the theory of plate tectonics is correct because scientists have found dinosaur bones of the same species in africa, asia, and in the americas. which means that they must have been together at one point in time. plate tectonics is also how the hawaiian islands were formed. as the plate hawaii is on was moving north west, magma would melt through the sea bottom and hardening. forming into the island chain. plate tectonics also explains the mariana trench. two plates were moving away from each other and made a giant crack in the ocean floor running 2,550 kilometers (1,500 miles)  long.