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. 

The spider picks a suitable place. The spider produces sticky silk from its abdomen. The spider attaches it to objects where it wants to build the web. The spider strings this silk back and forth between objects. A web is created. 
How does a spider make its web?

Sediment becomes loose from the rest of the soil. The sediment rolls down hill towards a river. The heavy items sink to the bottom. The lighter items float on the top and in convection cycles. As the river flows the sediment is moved. The sediment gets dumped through tributaries into lakes and the ocean. The sediment keeps moving around the world in convection currents. 
How is sediment transported across the Earth?

Magma cools inside the crust. Magma crystalizes. Lava cools on the surface. Lava crystalizes. Minerals dissolved in water crystlize. 

How do minerals form?

