<span>The correct answer is letter C. Plain. The landform that is characterized as large areas of low-lying flat ground is called the "Plain." It </span> is a broad area of relatively flat land. It <span>occur as lowlands and at the bottoms of valleys but also on plateaus or uplands at high elevations. </span>
Gravity pulls more strongly on denser materials so denser materials are at the center of things. Earth's core, at its center, is denser than its crust. The lowest layer of the atmosphere is denser than the upper layer. Earth's liquid metal outer core has convection, which generates the magnetic field.
The reason why beaches with larger rocks usually indicate the presence of high energy waves is : D. High-energy waves carry larger pieces of rock than low-energy waves
Low energy waves tend to not having enough force to move rocks with larger mass, which indicate the presence of high-energy wave
hope this helps
Sources are from NationalGeographic.org
"Decompression melting involves the upward movement of Earth's mosty-solid mantle. ... Decomposition melting often occurs at divergent boundaries, where tectonic plates separate. The rifting movement causes the buoyant magma below to rise and fill the space of the lower pressure. The rock then cools into new crust."
