Earth's Layers & Drift
This outermost layer is where we live and plants grow
What is the crust?
Rocks formed from cooled magma or lava.
What are igneous rocks?
Breaking rocks into sediments without moving them
What is weathering?
Canada's "breadbasket" with fertile sedimentary soils for wheat.
What are the Interior Plains?
Name the boundary type: Plates pulling apart, filling with magma for new crust.
What is divergent?
THIS is a semi-solid layer of iron, magnesium, and silicon.
What is the mantle?
The process where sediments (e.g. sand, dirt, gravel) are pressed together into layers creating sedimentary rock
What is compaction?
Moving sediments by wind, water, or ice.
What is erosion?
The region with Canada's oldest rocks, scraped by glaciers into thousands of lakes.
What is the Canadian Shield?
Name the boundary: Plates grinding side-by-side, causing quakes.
What is transform?
Alfred Wegener's theory that continents, fitting together like a jigsaw puzzle, once formed THIS supercontinent.
What is Pangaea?
This cycle shows rocks continually melting, cooling, weathering, and transforming.
What is the rock cycle?
A glacier action like sandpaper scraping bedrock.
What is abrasion?
Rounded hills from ancient continent collision, rich in coal.
What are the Appalachian Mountains?
Name the boundary type: Denser oceanic plate sinks under lighter continental...
What is subduction?
Name a piece of evidence that supports Wegener's theory about continental drift
What are fossils, jigsaw puzzle, or mountains?
THIS type of rock is formed when other rocks are put under heat and/or pressure
What are metamorphic rocks?
Water freezing in cracks to expand and break rock.
What is frost wedging?
Swampy flats on Shield edges, with permafrost hindering farming.
What are the Arctic & Hudson Bay Lowlands?
Convection currents in this layer move plates like a conveyor.
What is the asthenosphere/mantle?
Earth's crust is made of THESE, according to Wegener, and the float around the earth's surface very slowly
What are plates?
What are weathering & erosion?
A type of chemical weathering that rusts rocks
What is oxidation?
This region is where glaciers gouged these massive basins now holding five great lakes.
What is the Great Lakes & St Lawrence Lowlands?
A Canadian scientist who theorized plates float on mantle currents.
Who is J. Tuzo Wilson?