Multiple Choice
50% of oxygen production through photosynthesis in the oceans is produced by which bacteria?
1. A Review of General Chemistry
Intro to Organic Chemistry
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What observation led James Hutton to propose that Earth must be extremely old?
A
The existence of fossils in sedimentary rocks
B
The presence of unconformities in rock layers
C
The formation of igneous rocks from lava
D
The discovery of radioactive decay
Verified step by step guidance1
Understand the concept of 'unconformities' in geology: Unconformities are surfaces in rock layers that represent a gap in the geological record, often due to erosion or lack of deposition over a significant period of time.
Recognize that unconformities indicate a long history: The presence of unconformities suggests that significant geological processes, such as erosion and sedimentation, have occurred over extended periods, implying an ancient Earth.
Consider the implications of unconformities: These features show that the Earth has undergone multiple cycles of deposition, uplift, and erosion, which require vast amounts of time.
Connect Hutton's observations to his theory: James Hutton observed these unconformities and concluded that the Earth must be much older than previously thought, as such processes could not occur in a short time span.
Reflect on the significance of Hutton's proposal: Hutton's idea that the Earth is extremely old laid the foundation for modern geology and the concept of deep time, challenging the prevailing views of his era.
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