When Grandma's fresh oatmeal cookies disappeared from the cooling rack, Jamal decided to investigate. He made a list of clues. Clue one: the back door was open a crack. Clue two: there were crumbs on the floor leading toward the laundry room. Clue three: his little sister, Kiara, was sitting at the table drawing and had paint, not crumbs, on her fingers. Clue four: from the laundry room came a soft crunching sound. Jamal tiptoed to the…
Try this question: Who took the cookies?
In St. Augustine, Florida, stands the Castillo de San Marcos, the oldest masonry fort in the continental United States. Spanish workers began building it in 1672, after pirates attacked the city and burned the earlier wooden forts. To make the new fort strong, the builders used coquina, a stone found nearby on Anastasia Island. Coquina is made of tiny seashells pressed together over thousands of years. When workers cut the stone, it was soft…
Try this question: Why did the Spanish build a stone fort?
The Hawaiian Islands were built by volcanoes rising from the bottom of the Pacific Ocean. Deep below the ocean floor is a hot spot, a place where melted rock called magma pushes upward. When magma breaks through the sea floor, it cools into new rock. Eruption after eruption, the rock piles higher until, after hundreds of thousands of years, it rises above the water as an island. The hot spot stays in one place, but the plate of Earth's crust…
Try this question: How fast does the plate above the hot spot move?