Earth history- 1

How old is the Earth?

• 4.6 million years

• 4.6 billion years

• 4.6 trillion years

• 4.6 quadrillion years

What are the four systems that make up the Earth?

• Geosphere, Hydrosphere, Atmosphere, Biosphere

• Lithosphere, Hydrosphere, Atmosphere, Stratosphere

• Geosphere, Hydrosphere, Mesosphere, Exosphere

• Lithosphere, Hydrosphere, Atmosphere, Troposphere

What is the geosphere? What are the changes in the geosphere that the Earth has suffered?

• The layer of gases around the Earth

• The layer of water covering the Earth

• The solid part of the Earth, including rocks and mountains. Changes: mountain formation, volcanic eruptions.

• The layer of life on Earth

What is the hydrosphere? What are the changes in the hydrosphere that the Earth has suffered?

• The layer of gases around the Earth

• The layer of water covering the Earth. Changes: glaciation and melting, changes in sea levels.

• The solid part of the Earth

• The layer of life on Earth

What is the biosphere? What are the changes in the biosphere that the Earth has suffered?

• The layer of gases around the Earth

• The layer of water covering the Earth. Changes: glaciation and melting, changes in sea levels.

• The solid part of the Earth

• The layer of life on Earth

What is the atmosphere? What are the changes in the atmosphere that the Earth has suffered?

• The layer of gases around the Earth. Changes: increase in greenhouse gases, depletion of the ozone layer.

• The layer of water covering the Earth

• The solid part of the Earth

• The layer of life on Earth

Why do scientists analyze rocks?

• To find fossils

• To understand the history of the Earth and its age

• To discover new minerals

• To study earthquakes

How do we find out the age of the Earth?

• Observing the sun

• Analyzing fossils

• Using radiometric dating of rocks

• Studying the oceans

What are the differences between absolute and relative dating?

• Absolute dating uses exact years, relative dating determines the order of events.

• Absolute dating is older, relative dating is more modern.

• Absolute dating is only used for fossils, relative dating is used for rocks.

• Relative dating uses exact years, absolute dating determines the order of events.

Which of the following best explains uniformitarianism?

• The idea that Earth's processes have always been the same throughout history

• The belief that only catastrophic events shape the Earth

• The concept that the Earth's age can be determined by observing rocks

• The theory that life on Earth began in the oceans