Space and Science

Which of Earth's systems was most affected by fossilized dinosaurs?

lithosphere

Identify each process as a carbon source or a carbon sink.

Carbon sink: photosynthesis, fossilization & ocean absorption Carbon Source: combustion & repsiration

Complete the passage about cyanobacteria.

About three billion years ago, single-celled organisms called cyanobacteria lived in Earth's oceans. They thrived on the ocean's abundance of carbon dioxide, which they used during the process of photosynthesis. Much later, this process allowed organisms, such as fish, to survive by extracting dissolved oxygen from ocean waters.

Complete the following sentences to correctly explain how life could have formed on Earth.

According to one hypothesis, life on Earth emerged from According to one hypothesis, life on Earth emerged from amino acids in the presence of large amounts of gases seeping from deep-ocean vents. Another hypothesis, called the primordial soup, suggests that the formation of life was due to the effects of lightning in Earth's atmosphere.

The Cretaceous-Paleogene was a mass extinction event in which nearly every single large, land-dwelling dinosaur went extinct. Which of the following did not result from this extinction event?

Meteorites struck the region that Mexico now occupies.

Select the correct answer from each drop-down menu.

Plants add carbon to the atmosphere during respiration and remove carbon from atmosphere during photosynthesis. These processes form the carbon cycle.

How did cyanobacteria affect Earth's early atmosphere?

They replaced carbon dioxide with oxygen in the atmosphere.

Which compound was abundant in Precambrian Earth's oceans, before complex life evolved on Earth?

dissolved carbon dioxide

Match each process to where it occurs in the carbon cycle.

https://docs.google.com/document/d/1mgKyCZu8kryxE5emDr64djWsN6HbURlAfODRCxbNsg4/present

After its formation, early Earth experienced several crucial events that were responsible for creating its spheres. Match each Precambrian event to the sphere it played the biggest role in creating.

lithosphere>Molten lava solidifies into a solid crust. atmosphere >Frequent volcanic eruptions emit large amounts of carbon dioxide. hydrosphere>Clouds form, followed by rains.