subsurface

"The geologists studied the rocks to learn about the history of the Earth. "

"My friend told me there was something in the box, but I didn't know what it was yet. "

"to embed something in clay, mortar, or sand"

"The program will run smoothly under these conditions: the computer has enough memory and the internet connection is stable. "

"The smooth surface of the kitchen table was perfect for setting the dinner plates. "

"The birds had built an amazing structure out of sticks and various discarded items."

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"floor a house with pine boards"

"Her voice was distinct despite the heavy traffic."

"The scientist analyzed the data to find a solution. "

"The recipe for cookies allows for variations, like adding chocolate chips or nuts. "

"The intricate formation of the puzzle pieces allowed the child to assemble a picture of a dog. "