Question

which event would most likely occur if earth did not retain the heat from its formation?
the inner core would liquefy.
seismic waves would move the crust.
the earth’s magnetic field would disappear.
the asthenosphere and outer core would solidify.

Explanation:

To solve this, we analyze each option:

• The inner core is solid due to pressure, not just heat from formation, so it wouldn't liquefy (eliminates first option).
• Seismic waves moving the crust is related to earthquakes and plate tectonics, not directly to retaining formation heat (eliminates second option).
• Earth’s magnetic field is generated by the outer core’s liquid iron movement (due to heat and convection). But the key here is about the heat from formation affecting the asthenosphere (part of the mantle, semi - molten) and outer core (liquid). If Earth didn't retain formation heat, the asthenosphere (which is semi - molten due to heat) and outer core (liquid due to heat) would lose enough heat to solidify. The magnetic field's generation is from the outer core's movement, but the question is about what happens if formation heat isn't retained. The asthenosphere and outer core being liquid/semi - liquid depend on heat. Without that retained heat, they would solidify. The third option's magnetic field disappearance is more about the outer core's movement stopping, but the most direct effect of losing formation heat is the solidification of the asthenosphere and outer core.
• The asthenosphere (semi - molten mantle layer) and outer core (liquid) exist because of heat (including from formation). If that heat isn't retained, they would cool and solidify.

Answer:

The asthenosphere and outer core would solidify.