7 Sending stuff to Mars is very expensive. The cheapest way to colonize will be to make everything there. "It's really all about the resources," says Dyar. "If we find things there that allow us to sustain human life, then we can settle there." Mars has plenty of metals and rock, and probably lots of water, but no wood or petroleum (which is used to make gasoline, plastic, and many other useful products). The settlers could make bricks from local dirt. Mars has plenty of silicon and iron, elements that will allow people to produce glass and steel. [3] And of course, everything sent to Mars will stay on Mars. Martian citizens will be really good at recycling. ANALYZE ORGANIZATIONAL PATTERNS Annotate: Highlight the subheads in this article. Analyze: Which main organizational pattern is the author using? How can you tell? G​