According to Piaget, which two perceptual deficiencies underlie young children's inability to conserve?
A)

object permanence and lack of symbolic thought

B)

concrete thinking and equilibration

C)

assimilation and accommodation

D)

centering and lack of reversibility

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.