Why does lava from volcanoes give information about Earth's interior?

Correct answer: Because it originates from internal magma

The direct answer is A: lava originates from internal magma and therefore can reveal information about material from inside Earth. Deep inside Earth, molten or partly molten rock is called magma. When this material reaches the surface through a volcanic opening, it is called lava. Scientists can study its minerals, chemical composition, temperature and gases to infer conditions in the interior, especially in the mantle and upper crust. It is a direct, or relatively direct, source of information compared with indirect evidence such as seismic waves, gravity or magnetism. Option A is correct because volcanic lava is surface material brought upward from Earth’s interior. Option B is wrong because lava does not fall from clouds; rain falls from clouds. Option C is wrong because sea waves may erode or move rocks, but they do not create volcanic lava. Option D is wrong because lava does much more than change soil colour; it provides rock and chemical evidence about internal materials. The safe memory cue is: magma inside, lava outside; lava carries a sample upward.