Naming the Anthropocene

What caused the rise in Carbon dioxide (CO2) nearly 7000 years ago?

What activities led to the increase in methane (CH4) nearly 5,000 years ago?

What is the epoch that started 2.6 million years ago?

• Pleistocene

• Holocene

• Miocene

• Pliocene

What is the main cause of glacial cycles according to the image?

• A) Changes in Earth's atmosphere

• B) Changes in Earth's orbit around the sun

• C) Changes in Earth's magnetic field.

Fill in the blank: Changes in the shape of the Earth's orbit (eccentricity) occur approximately every ______ years.

• 100,000 years.

• 50,000 years.

• 200,000 years.

• 500,000 years.

Fill in the blank: Changes in the tilt of the Earth's axis (obliquity) occur approximately every ______ years.

• 43,000 years.

• 26,000 years.

• 100,000 years.

• 19,000 years.

What is the range of Earth's axial tilt over the last million years?

• A) 20.1 to 22.5 degrees

• B) 22.1 to 24.5 degrees

• C) 23.1 to 25.5 degrees

What happens as ocean temperatures rise?

• Oceans absorb more CO2

• Oceans release CO2 into the atmosphere

• CO2 levels remain constant

• CO2 is trapped in ice

What do odd numbers represent in Marine Isotope Stages (MIS 1-19)?

• Glacials

• Interglacials

• Both

• Neither

What do even numbers represent in Marine Isotope Stages (MIS 1-19)?

• Glacials

• Interglacials

• Both

• Neither