The Earth is mostly covered by water. Ask your kids to name examples of land and water, then look at a worksheet with them. Ask them to identify pictures that show land and water, then help them check.
Ask your child what the building you live in is called. Is it a home, restaurant or hospital? Then look at the pictures in the worksheet and ask them to identify which are homes - even if they don't look like yours. Check the box next to the homes in the pictures.