SSA Review 4 – Earth’s History

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Presentation transcript:

SSA Review 4 – Earth’s History

Fossils How do scientists know what changes occurred long ago inside and on the Earth's surface?

Fossils Fossil – the preserved remains or traces of living things

Fossils *most fossils form when living things die and are buried by sediment. *the sediment slowly hardens into rock and preserves the shape of the organism.

Fossils *What fossils show us (the fossil record): 1 – shows evidence about past life and environments on Earth

Fossils *What fossils show us (the fossil record): 2- shows how different groups of organisms have changed over time

Human Impact on Earth’s Landforms *Agriculture *Mining *Deforestation *Desertification *Urbanization

Agriculture * farming * raising livestock (animals)

Mining - The removal of non-renewable resources from the land *rocks, minerals, metals

3. Development/Urbanization *towns and cities *buildings, houses, roads, etc.

Desertification – Fertile land becoming barren Caused by: *Drought *Overgrazing by livestock *Cutting down trees for lumber

Advantages ? Disadvantages ? Deforestation – Cutting down forests for wood products or to make way for developments Advantages ? Disadvantages ?