Chapter 8.1 Flashcards
What are the three rock types?
- Igneous
- Sedimentary
- Metamorphic
What is the rock cycle?
The rock cycle summaries how the three rock types form and change over thousands of years.
What is weathering?
Weathering is the breakdown of materials on the earths crust.
What is Erosion?
Erosion is the process where weathered roc is carried away.
What are the different types of erosion?
- Gravity
- Water
- Wind
- Ice
What is the structure of the earths crust?
- crust
- asthenosphere (top part of the mantle)
- mantle
- outer core
- inner core
What is physical weathering? Temperature
Temperature: heating and cooling of the rocks surface. Causes slaps or layers of rock to brake off.
What is chemical weathering?
When chemicals in the air and water react with the earth and break it down.
What is physical weathering? Water and ice.
Water and ice: water seeps into cracks in the rocks and freezes. It expands 9% when it freezes and punches the rock apart.
What is physical weathering? Water and ice glaciers.
Warmer and ice-glaciers: frozen rivers of ice make U shaped valleys.
What is physical weathering? Plants.
Plants: trees or shrubs grow through the cracks in rocks. As they grow their roots wedge apart the rock.
What is physical weathering? Wind.
Wind: the breakdown of rocks caused by friction. Moving sand/pebbles carried by the wind hit the rocks weathering it away.
What is deposition?
Deposition is the settling of Brocken rock materials.
What is compaction and cementation?
As sediments build up the pressure squeezes out some left over water and the seed ant hare now compact. The remaining minerals in the groundwater cement the compacted rocks together
