In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 
--------
Question: A star burns in space. Eventually it burns all its hydrogen. Becomes a red giant. Once the red giant burns itself out. The core of the star collapses. The gasses will start to disperse. Only the core is left. A white dwarf has been formed. 

Answer: How is a white dwarf star formed?


Question: Carbon dioxide from the air passes through small pores (holes) in the leaves. These pores are called stomata. Water is absorbed by the roots. It passes through vessels in the stem on its way to the leaves. Sunlight is absorbed by a green chemical in the leaves. 

Answer: What happens during photosynthesis?


Question: Magma rises through cracks in the Earth's crust. The pressure causes plates to move. Magma explodes to the surface. The lava from the eruption cools to form new crust. After several eruptions, the rock builds up and a volcano forms. 

Answer:
What causs a volcano to erupt?


