Which of the following is one of the three factors that contribute to the periodic changes in Earth's temperature known as the Milankovitch cycles? (1 point) Responses The concentration of carbon dioxide in Earth's atmosphere is decreasing The concentration of carbon dioxide in Earth's atmosphere is decreasing Earth's orbit alternates between a circular and an elliptical shape Earth's orbit alternates between a circular and an elliptical shape Earth's shape is spherical Earth's shape is spherical Earth's atmosphere has been enriched in oxygen by cyanobacteria

The correct answer is:

- Earth's orbit alternates between a circular and an elliptical shape

What is ozone?(1 point) Responses a type of fossil fuel that releases toxins into the air a type of fossil fuel that releases toxins into the air a gas produced when nitrous oxide combines with oxygen a gas produced when nitrous oxide combines with oxygen a gas composed of molecules with three oxygen atoms a gas composed of molecules with three oxygen atoms a mixture of carbon dioxide and oxygen gases

The correct answer is:

- A gas composed of molecules with three oxygen atoms

What tool gives scientists the best data to study the current loss of ice near the poles?(1 point) Responses Argo floats Argo floats air bubbles trapped in ice air bubbles trapped in ice ice core samples ice core samples satellite measurements

The correct answer is:

- Satellite measurements

Why should a model of the carbon cycle include the burning of fossil fuels?(1 point) Responses Burning fossil fuels moves carbon from the atmosphere to the geosphere. Burning fossil fuels moves carbon from the atmosphere to the geosphere. Burning fossil fuels moves carbon from the atmosphere to the hydrosphere. Burning fossil fuels moves carbon from the atmosphere to the hydrosphere. Burning fossil fuels moves carbon from the geosphere to the atmosphere. Burning fossil fuels moves carbon from the geosphere to the atmosphere. Burning fossil fuels moves carbon from the hydrosphere to the atmosphere.

The correct answer is:

- Burning fossil fuels moves carbon from the geosphere to the atmosphere.