When did oxygen levels start to decline from 35 percent down to today’s levels

On the map below, which of the following rivers is identified by blue? the huang he river the yangtze river the han river the naktong river

Identify the type of weathering seen in each picture ? chemical weathering mechanical weathering

Which features do all new rocks formed near an oceanic ridge share? check all that apply. pillow-shaped striped pattern provide evidence to seafloor spreading made from molten material iron oriented in same direction