Cathy lives in the city of Toronto in the province in Ontario. She loves to build skyscrapers with her blocks. She shows us the difference between urban and rural places and that water runs down hill. We follow a path between the Great Lakes and learn about where rain comes from. U is for under ground when Cathy takes the subway and we learn to count each station. Cathy shows us the crust of the Earth and how the earth settles in layers of density.