1. How did Earth's oceans form?

Group of answer choices

Melting of ancient glaciers

outgassing from volcanoes created rain

only from asteroid impacts

Earth always had oceans

2. If Earth's outer core was solid iron instead of liquid iron,would it still have a magnetic field?

Group of answer choices

yes

no

No answer text provided.

No answer text provided

3. What is the lithosphere?

Group of answer choices

The oceanic crust

The partially molten lower mantle

The solid crust and upper mantle

The continental crust

4. What is the asthenosphere?

Group of answer choices

The solid crust and upper mantle

The partially molten lower mantle

The outermost core

The upper atmosphere