Question

how has earth changed over time?
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1. describe a scientist thinks that the continents of australia and antarctica were once joined together. describe the evidence the scientist might look for to support their idea.

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Explanation:

The theory of continental drift suggests that continents were once joined. Evidence could include similar rock formations (matching geological layers), fossil distribution (same ancient species fossils on both continents), and the fit of the continental coastlines (like puzzle pieces).

Answer:

The scientist might look for:

• Similar rock formations: If the rock layers, types, and structures in Australia and Antarctica match, it could indicate they were once connected. For example, if there are identical sequences of sedimentary, igneous, or metamorphic rocks in corresponding areas of the two continents.
• Fossil evidence: Fossils of the same ancient plant or animal species found on both continents. Since many ancient organisms could not cross wide ocean barriers (as Australia and Antarctica are now separated by the ocean), similar fossils would imply the continents were close or joined when those organisms lived.
• Coastline fit: The shape of the Australian and Antarctic coastlines. If they seem to “fit” together like pieces of a jigsaw puzzle (even after accounting for erosion and other geological changes over time), it could support the idea of them once being joined.