International Date Line IDL
First, we have a nice thick atmosphere that deals with many meteors. Secondly, weathering and erosion erase the marks fairly quickly.
the mass extiction
rift
Sunspot
The International Date Line which is located in Grenwich, England.
When you cross the International Date Line, you move from one day to the next. This imaginary line on the Earth's surface marks the change in calendar days.
Yes. But it is unstable unless there is a "thermocline" (a change in temperature that marks a change in density). As to how deep - as deep as the ocean gets (about 7 miles). P.S. fish do it all the time, submarines have to practice at it.
I think the answer is called ripple marks
The two places that mark the end of earths axis are North and south pole.
your moma
your moma
Hoof Marks - 1927 was released on: USA: 13 November 1927