Answer:
We live in the Phanerozoic EON
Explanation:
Carbon dioxide, oxygen, water, and acids may all cause chemical weathering. Mechanical weathering is the process of breaking a large rock into smaller pieces without changing the minerals in the rock. Mechanical weathering may be caused by frost, ice, plant roots, running water, or heat from the sun.
Answer:
The activation energy must be reached. The catalyst makes lower energy pathways available.
Explanation: