Yes, Mount Baker has erupted in the past and ejected volcanic rock. While it hasn't had a major eruption in recent history (last significant eruption was around 1843), it is considered an active volcano.

Here's what we know about Mount Baker's volcanic activity:

* Past Eruptions: Mount Baker has erupted numerous times in the past, with some eruptions being quite explosive.

* Volcanic Rock: These eruptions produced volcanic rock, including lava flows, ash deposits, and pyroclastic flows.

* Active Volcano: Mount Baker is classified as an active volcano, meaning it has the potential to erupt again.

* Monitoring: The U.S. Geological Survey (USGS) closely monitors Mount Baker for signs of unrest.

While Mount Baker hasn't had a major eruption in centuries, it's crucial to remember that it is an active volcano and could erupt again.