Question

Stromatolites form when(1 point) Responses continents drift apart and isolate areas of the biosphere. continents drift apart and isolate areas of the biosphere. volcanoes erupt and kill surrounding organisms. volcanoes erupt and kill surrounding organisms. oxygen reacts with iron in rocky layers. oxygen reacts with iron in rocky layers. cyanobacteria grow on top of rocks and harden as others grow on top of them

Answer 1

Compare the early Earth atmosphere to modern Earth atmosphere. (1 point) Responses The is now less oxygen, increasing carbon dioxide, and increasing temperatures. The is now less oxygen, increasing carbon dioxide, and increasing temperatures. There is now less carbon dioxide, less oxygen, and decreasing temperatures. There is now less carbon dioxide, less oxygen, and decreasing temperatures. There is now more oxygen, increasing temperatures, and increasing carbon dioxide. There is now more oxygen, increasing temperatures, and increasing carbon dioxide. There is more oxygen, decreasing carbon dioxide, and decreasing temperatures.

Answer 2

What do red lines in rocks indicate about the biosphere?(1 point) Responses Continental drift affected the biosphere. Continental drift affected the biosphere. Oxygen is being produced by the biosphere. Oxygen is being produced by the biosphere. Volcanic action has damaged the biosphere. Volcanic action has damaged the biosphere. Carbon dioxide is being produced by the biosphere

Answer 3

. cyanobacteria grow on top of rocks and harden as others grow on top of them.

Answer 4

There is more oxygen, decreasing carbon dioxide, and decreasing temperatures in the modern Earth atmosphere compared to the early Earth atmosphere.

Answer 5

Oxygen is being produced by the biosphere.