The mantle had less aluminum and less silicon
Answer:
Convergent boundary forms trenches, volcanoes and mountain ranges.
divergent boundary forms rift valleys and oceanic ridges
transform boundary causes eqarthquakes
Photosphere is the surface of the sun that is visible to the eyes. It is believed to be one of the coolest part of the sun. The dark spots on the photosphere are known as the sunspots. Sunspots are usually visible in groups and are temporary because they only come and go. Magnetic fields are believed to have been involved in the occurence of the sunspots. Solar prominences are sometimes associated with the occurence of sunspots. They are active events that occur when sheets of gases are released from the active regions.
Answer:
because it is largely an inhospitable desert
