<span>In a volcano, you can observe a crack on the surface of the earth, from which molten lava comes out. The earth's crust basically breaks, and the high temperature and pressure melts the rocks present deep in the earth, which comes out during a volcanic eruption.</span>
The correct answer is B. Placas tectónicas.
Explanation
Las placas tectónicas son los fragmentos de la corteza terrestre que están flotando sobre las capas de roca fundida (conocida como la astenosfera). En la tierra existen al menos 15 placas principales y más de treinta placas de tamaño mínimo. Las placas están en constante movimiento por las corrientes convectivas de la astenosfera no que le da origen a fenómenos como los volcanes, los sismos, la formación de cadenas montañosas y dorsales oceánicas. De acuerdo a lo anterior, la respuesta correcta es la B. Placas tectónicas.
The beginning of the Precambrian<span> period starts with the formation of Earth about 4.5 billion years ago and ends at the first sign of complex life about 540 million years ago. Though the </span>Precambrian<span> Period is often referred to as a period, it's actually the only supereon, which means that it spans multiple eons. The Precambrian is known as the geologic era. The Precambrian is the 1st era. hope that helped</span>
