1which of earths spheres contains most of its mass?
a atmosphere b hydrosphere c geosphere* d biosphere 2 erosion and weathering are examples of which types of forces?
a constructive forces b destructive forces* c gravitational forces d inertia-related forces 3 which of the following statements about earths atmosphere is true?
a earths atmosphere contains 78% water vapor which is essentail to life
b earths atmosphere contains 21% oxygen c earths atmosphere contains carbon dioxide which all life forms require
d earths atmosphere allows radiation from the sun to pass through it and warm earths surface*
4 the strenght of the force of gravity between two objects is determined by which of the following factors? select all that apply
a the messes of the objects* b the distance between the objects* c the volumes of the objects d the surface area of the objects 5 earth and moon are kept in there respective orbits due to the influence of
a inertia b gravity c gravity and inertia* d neither gravity or inertia *= my answer