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Scientists chose where units of geologic time began and ended based on major changes in life forms at certain times.
The ..... era covers almost 90% of earth's history.
Rock layers tell a story about their past. What is the basic assumption that is made when reading this story?
The composition of the Earth's atmosphere has been constant.
The Earth's crust cooled and then remelted before rock layers began to form.
The processes in the rock cycle were the same in the past as they are today.
Chemical reactions in the past were slower than they are today.
Which of the following conditions help preserve organisms as fossils
quick burial by sediments
correctchoice hard parts
correctchoice protection from scavengers
activities of microorganisms
What can we learn from fossils?
How earthquakes formed.
How erosion changed mountains
How Earth's magnetic field was formed
How Earth's environment has changed
There are 5 questions to complete.