AST101 Lecture 14

2 Pages
70 Views
Unlock Document

Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Dan Dolderman
Semester
Fall

Description
how do craters form? • Mercury or moon – surface that hasn't been melted or eroded – craters overlap one another • for earth we don't see them, we only see the recent (unclear) ones • earth orbits the sun at 30 km every second • escape speed of earth 11 km • if an object makes its way through the atmosphere – fast enough to vaporize rock (in earth most of the objects will be vaporized) shock waves of craters • raised central region – big object that comes in = shock waves through the rocks • shock waves can bounce off other layers of other rocks causing the central regions to bounce up click quiz • dropping a bowling ball into a sandbox from the top of the CN tower and it leaves a depression • Q: is this depression the same as a crater on mercury or the moon? • A: no • explanation: difference in distance from the object being dropped, it will not vaporize shaping planet surfaces what can erase craters • erosion • tectonics – surface of earth is moving = continental plates are moving (the ground they are on is subducted and melted) • volcanoes – earths core still hot = layers over the surface of earth with magma/lava erosion • grinds stuff down (mountains) plate tectonics • earth and venus – active geology (heat coming out of earth, convective motion in the mantle – tectonic plates – causing seduction zones = crust is melting releasing lava • tectonic plates are driving volcanoes clicker quiz • Q: icy moon of saturn (enceladus) - which part of its su
More Less

Related notes for AST101H1

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit