How does talking relate to reading?

"Reading floats in a sea of talk" (Britton, 1970). The size of a child's spoken vocabulary impacts on the ease and speed with which they learn to read. Reading is a powerful tool in developing the relationship between child and parent as well as in growing language and literacy. Books often contain vocabulary that is more sophisticated than words used in everyday conversation.

Reading builds vocabulary and concepts 

If a child starts school advantaged in vocabulary, conceptual knowledge and oral expression, they are well prepared to move into literacy. Children with a more limited vocabulary struggle to get understand and learn new concepts. Children who are familiar with books and stories before they start school are better prepared to cope with the demands of formal literacy teaching. There is an important transition point about age 7-8, when children move from learning to read to reading to learn. Children who struggle to achieve this may never catch up.