Question

7 multiple choice 1 point the division of earths geologic history into units of time called eons, eras, periods, and epochs is based on- seismic and tectonic data absolute dating techniques climate change fossil evidence and geologic events

Explanation:

To determine the basis for dividing Earth’s geologic history into eons, eras, periods, and epochs, we analyze each option:

• Seismic and tectonic data: These relate to Earth's structure and earthquakes, not time division of geologic history. Eliminate this.
• Absolute dating techniques: While they help date rocks, the division of geologic time units (like eons, eras) is based on major changes seen in fossil records and geologic events (e.g., mass extinctions, mountain - building events), not just absolute dating. Eliminate this.
• Climate change: Climate change is a factor within geologic time but not the primary basis for dividing geologic time into large - scale units like eons and eras. Eliminate this.
• Fossil evidence and geologic events: The geologic time scale is constructed by identifying major changes in the fossil record (e.g., appearance or extinction of major groups) and significant geologic events (e.g., the formation of supercontinents, mass extinctions). These changes mark boundaries between different time units.

Answer:

D. fossil evidence and geologic events