For at least the first half of Cretaceous Period, atmospheric temperatures were A. about the same as they are today, and sea levels were also similar B. at least 8 degrees warmer than today, and sea levels were high C. cooler than today and sea levels were lower

Climate studies of the Cenozoic era show that temperatures have ________ over time.Group of answer choicesfluctuated, sometimes greatly,steadily increasedsteadily decreasedstayed basically the same

Match the era on the left with its characteristic on the right.PrecambrianCenozoicPaleozoicMesozoic?When Earth formed?The age of dinosaurs?When most of our limestone and coal formed?The era of humans

The extreme drop in temperature that occurred approximately 2.5 billion years ago was BEST correlated with which of the following changes? Increase in atmospheric methane (CH4). Decrease in atmospheric nitrogen (N2). Decrease in atmospheric carbon monoxide (CO). Increase in atmospheric oxygen (O2) Decrease in atmospheric carbon dioxide (CO2).

Multiple Choice QuestionWhich of the following types of data used to reconstruct ancient climates provides us with the longest look back into how atmospheric temperatures have changed over time?Multiple choice question.Air bubbles in ice coresTree ringsPollen in mud layers

Which is a description of the Paleozoic era?A.The era of humansB.The age of the dinosaursC.The hottest eraD.The rise of lif