Geologists observed signs of widespread ancient glaciers from the same time period in areas across South America, Africa, Antarctica, India, and Australia. What theory did this observation support?(1 point) Glaciers were once more common than they are today. Most of Earth was once covered in a vast ice sheet. Earth was much farther than the sun than it is today. Those continents were once together as one supercontinent.

1) Which features do most stratovolcanoes and cinder cone volcanoes have in common? *steep sides and violent eruptions*

2) Geologists observed signs of widespread ancient glaciers from the same time period in areas across South America, Africa, Antarctica, India, and Australia. What theory did this observation support? *Those continents were once together as one supercontinent.*

3) Ocean trenches form over millions or billions of years. Which statement accurately describes how ocean trenches form? *a plate of oceanic crust is subducted under a plate of continental crust*

4) Iron particles in basalt on the ocean floor tell scientists *the direction of the magnetic field*.In two adjacent magnetic stripes, the iron particles show *different* alignments.

5) Why is no land created or destroyed at transform boundaries? *because the plates only slip past each other at these boundaries*

6) In trying to prove continental drift, Alfred Wegener used evidence from long ago to show that in the distant past, similar animal species lived in places that are *separated by great distances* today. For example, fossils of the *Lystrosaurus* were found in India, Africa, and Antarctica.

7) Which statement identifies a major reason for the subduction that helps to form volcanoes? *the difference in density of oceanic and continental plates*

8) Along which features does seafloor spreading occur? *mid-ocean ridges*

*Answers*

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