Winter Finals 6th
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
What is a fossil?
The remains of a dead organism.
How do most fossils form?
When an animal dies and is covered by sediment.
What is a fossil formed when minerals replace all or part of an organism?
Petrified
What can provide clues about the activities of ancient organisms?
Trace Fossils
The process by which all the different kinds of living things have changed over long periods of time is called ____.
Evolution
A type of organism that no longer exists on Earth is said to be ____.
Extinct
The relative age of a rock is ____.
The age of the rock
What does the law of superposition state?
That the oldest layer of a rock is at the bottom and younger layers are toward the top
The fossils of organisms that were widely distributed but only lived during a short period of time are called ____.
Index Fossils
What is the geologic time scale a record of?
Life forms that have lived on Earth
What were the earliest life forms?
Single celled organisms
What were the first vertebrates?
Jawless fish
Many scientists hypothesize that the dinosaurs became extinct because ____.
Of an astirod
Fossils usually occur in _________________________rock.
sedeimentary
Plant leaves may form a fossil called a(an) _________________________a thin layer of carbon on rock.
Carbon Film
_________________________are scientists who study fossils.
paleontologists
What is the relative age of a rock?
An apoximate age of a specific rock or rock layer
What is the absolute age of a rock?
The absolute age of a rock in years.
What is an index fossil?
The fossils of organisms that were widely distributed but only lived during a short period
Geologic time begins with a long span of time called _________________________Time.
precambrian
Be able to label fossils.
Can you?
Be able to determine the relative age of rocks when given a diagram.
Can you?
What is the correct order (starting from the surface) of Earth’s layers?
Crust, Mantle, outer core, and inner core
Earth’s inner core is….
a hot solid dense ball of metal 4th layer counting from crust down