Question

activity b: fossil evidence
get the gizmo ready:

• make sure your screen is showing your map of pangaea.
• under evidence choose fossils.
• adjust your map if needed.

question: what do fossils and rocks tell us about pangaea?

1. review: the brown areas in the gizmo show where fossils of lystrosaurus have been found. lystrosaurus looked a bit like a dinosaur but lived in a time before dinosaurs. lystrosaurus probably couldnt swim very far. how might the locations of lystrosaurus fossils be seen as evidence that the continents were once together?
2. review: the green areas in the gizmo show where fossils of glossopteris have been found. think about how seeds of plants can be transported to different locations. how might the locations of glossopteris fossils be seen as evidence that the continents were once together?

activity c: rock evidence
get the gizmo ready:

• make sure your screen is showing your map of pangaea.
• under evidence choose rocks.
• adjust your map if needed.

1. review: now under evidence choose rocks. the purple areas are mountains that formed when landmasses collided 450 million years ago. the orange areas show rocks that formed about 2 billion years ago. how might the locations of these mountains and rocks be seen as evidence that the continents were once together?
2. extend your thinking: find where india is on your map of pangaea. think about the current location of india. (if needed click reset to return to the current world map and watch india closely.) the himalayan mountains are found on the border of india and eurasia. how do you think these mountains were formed?

Explanation:

1. Lystrosaurus couldn't swim far, yet its fossils are in different locations. This implies that the continents where these fossils are found were once joined, allowing the species to inhabit a continuous land - mass.
2. Glossopteris is a plant. While seeds can be transported, the wide - spread distribution of its fossils in different continents suggests that these continents were once connected, enabling the plant to grow across a single large area.
3. The presence of mountains formed from landmass collisions and rocks with similar formation ages in different continents indicates that these continents were once part of a single landmass (Pangaea) that has since broken apart.
4. The Himalayan Mountains were formed due to the collision of the Indian tectonic plate with the Eurasian tectonic plate. As India moved from its position in Pangaea and collided with Eurasia, the immense pressure caused the uplift of the land, forming the Himalayas.

Answer:

1. Since Lystrosaurus couldn't swim far, the presence of its fossils in different continents implies the continents were once together as a single landmass where it could roam freely.
2. The wide - spread locations of Glossopteris fossils suggest that the continents were once joined, allowing the plant to grow across a single large area before the continents drifted apart.

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