Mohorovicic discontinuity from seismic evidence is determined that it is approximately at a depth of 30-40 km.

The upper mantle is furr divided into two layers of 400 and 600 km thickness respectively.

The asnosphere is believed to be source of much volcanic activity and many or processes. It is said be to located completely in upper mantle.

The Middle layer or B-layer of continental crust is relatively dense compared to A-layer and density is said to be 2.4 to 2.6 g/cc.

The inner core with a thickness of around 1790 km is believed to be a solid body.

The first options, Mountainous, Continental and Oceanic areas are studied separately whereas Glacial area is not considered under study of crust as such.

It is believed that thickness of crust under Himalayas is 70 to 75 km and under Hindukush it is said to be 60 km thick.

It is in solid state is not true and remaining options are true and y are characteristics of asnosphere. In Greek, ?asnes? means without strength and hence name.

Mohorovicic discontinuity marks lower boundary of crust which is first layer of Earth.

The inner core, is believed to be in solid metallic state and is said have thickness of about 1790 km.