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"touching the earth." A native speaker would use that phrasing. "Earth" in this context has the double meaning of literal soil and "the earth," the planet.
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/9150 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/9150 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/