This layer of the atmosphere is known for having temperatures as low as -90C. (A Mesosphere (B Thermosphere (C Ionosphere (D Exosphere

Answer (datum point);

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

Sonar is an application of the doppler effect used by submarines.  this test was on k12.