What mission is set to explore mars
kepler
exomars
it's origin
it's size

Exomars is the mission that is set to explore Mars.

To add, Exobiology on Mars or ExoMars is Martian astrobiology project that aims to look for evidence of life on Mars and it is a two-part Mission by  European and Russian Space Agency.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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