You can add more water or more cornstarch until you get it right. When it is just right you should be able to make it change from a liquid to a semi-solid and back again in an instant by just squeezing or releasing it the goo. When you squeeze the goo you press the starch granules close together and make it hard like a solid. Pine trees belong to an ancient family of plants called conifers. In fact, conifers have been around so long that some types of dinosaurs probably munched on them.
Conifers have needles for leaves that stay green all year long and make their seeds inside of cones.
The cones have woody scales and on each scale is a pair of little winged seeds that can some day become a new tree. Those little seeds need to stay dry so when it rains the cone scales close up to protect the sees. You can see this for yourself. Find a pine cone with its scales open. Look on the scales to see if there are any seeds, if not you'll still be able to see where they were.