"According to Piaget, is at the heart of , which is a major advance for preschool children."

- Symbolic function; language

Explanation:

Piaget states that 'symbolic function' lies at the center of 'language.' Symbolic function is characterized as the ability that allows the children to use symbols to signify objects or events. In the age of 2-4(preschool kids), the children develop this ability and they are able to develop mental images representing distinct objects. This is the beginning of the use of language as they learn to use words to represent ideas or objects that are a major advancement for the preschool children and takes them towards the Intuitive thought substage.

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.

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