Tunnels! by Jeanette Moore

Author:Jeanette Moore
Language: eng
Format: epub
Publisher: Nomad Press

You can read more about Elon Musk’s ideas in this article.

KEYWORD PROMPTS

Elon Musk Verge tunnel

WORDS TO KNOW

split-spoon sampler: a tool for measuring the density of soil.

density: a measure of how closely packed items are.

tunnel boring machine (TBM): a large machine with a drill in the front that can bore holes through hard rock to make tunnels.

efficient: wasting as little time or effort as possible when completing a task.

Another tool a geologist uses is the split-spoon sampler. This measures the density of soil. A 140-pound hammer drives the sampler into the ground. The more times the split-spoon must be hit with the hammer to push it into the soil, the denser the soil.

LET’S GET EXCAVATING

Once the reports are complete and the ground passes inspection, then it is time to dig! In ancient times, shovels were the main tool, and workers dug by hand. But today, most of the digging is done with machinery.

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