The planet that is the only one with liquid water on its surface, an outer core and crust broken into large plates is Earth. Earth is the only planet in our solar system that has all of these features, which are essential for life as we know it. The liquid water on Earth's surface allows for the existence of oceans, rivers, and lakes, which are home to a wide variety of aquatic life. The outer core of Earth is made of molten iron and nickel, and it generates Earth's magnetic field, which protects the planet from harmful solar radiation. The crust of Earth is broken into large plates, which move around on the Earth's surface over time. This movement of the plates is responsible for the formation of mountains, volcanoes, and earthquakes.