Earth in Space
What is the movement of Earth spinning on it's axis called?
Rotation
What are the large pieces of Earth's crust that slowly move?
Tectonic plates
What is weathering?
The breaking down of rocks into smaller pieces
Where does seafloor spreading mainly occur?
At mid-ocean ridges
About how long does it take Earth to complete one rotation?
24 hours (1 day)
What supercontinent existed millions of years ago before the continents separated
Pangaea
What is erosion?
The movement of weathered rock and soil from one place to another
During seafloor spreading, new crust is formed from what material?
Magma
What is the movement of Earth around the Sun called?
Revolution
What scientist proposed the theory of continental drift?
Alfred Wegener
Name one reason that might cause erosion?
Water, wind, ice, or gravity
What happens to older ocean crust as new crust forms?
It moves away from the mid-ocean ridge
About how long does it take Earth to complete one revolution around the Sun?
365 Days (1 year)
What happens when two continental plates collied?
Mountains can form
Which type of weathering occurs when plant roots grow into cracks and break rocks apart?
Mechanical (Physical) weathering
What scientist is credited with proving evidence for seafloor spreading?
Harry Hess
Earth's axis is tilted about how many degrees, causing the seasons?
23 degrees
What evidence helped support continental drift? Name one.
Matching fossils, matching rock layers, ancient climate evidence, or contents fitting together like puzzle pieces.
A river carrying sediment downstream is an example of what process?
Erosion
What evidence om the ocean floor helped prove seafloor spreading?
Symmetrical magnetic stripes (Magnetic reversals) on both sides of mid-ocean ridges