Answer:
Index fossils, intrustions and cross-cutting relationships.
Explanation:
The correct list of three different geologic features that help scientists determine the relative ages of rocks by their position is "index fossils, intrusions, and cross-cutting relationships".
Answer:
There are 50 states in the United States of America
The volcanic intrusion rule is relative dating
The correct answer is D
Comets are held together by frozen gases
Comets are floating particles of ice and dust held together by frozen gases such as methane,water,ammonia and carbon dioxide. They are basically chunks of ice and dust.