Mars's 3 layers are the crust, mantle, and core. Mars's crust is red and dust. Mars's mantle is made up of helium and rock substances. Mars's core is very hot. It is made up of iron.
There is no crust
Since Mars lacks plate tectonics, the volcanoes were probaly formed by hot spots. These are areas where extra hot mantle material wells up and collects beneath the crust where some of it melts and rises through the crust to form volcanoes.
: Why do astronomers conclude that the crust on Mars must be thicker then Earth's crust?
Mars
Mars's 3 layers are the crust, mantle, and core. Mars's crust is red and dust. Mars's mantle is made up of helium and rock substances. Mars's core is very hot. It is made up of iron.
There is no crust
Since Mars lacks plate tectonics, the volcanoes were probaly formed by hot spots. These are areas where extra hot mantle material wells up and collects beneath the crust where some of it melts and rises through the crust to form volcanoes.
: Why do astronomers conclude that the crust on Mars must be thicker then Earth's crust?
No, because mars' crust has a gas that makes its crust grow mehdeas and therefore earth has a much stronger crust.
Mars
How hot is it on Mars in Spring and Fall? How hot is it on Mars in Spring and Fall?
Mars is smaller than Earth and consequently cooled quicker. Mars no longer has a molten core like Earth, so it would be fair to say it has a thicker crust.
The crust is thinner in the north.
56.5 km
Mars
Mars