Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes, but they now know that it is continuously created by the heat of the radioactivity deep inside the planet.
Meaning:
Breaking the sentence into clauses:
- Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes.
- but they now know that it is continuously
...
Meaning:
Breaking the sentence into clauses:
- Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes.
- but they now know that it is continuously
...
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