You can visit the USGS website for an enormous variety of geology related information. These topics include- 

Landslide Hazards

Earthquakes

Volcano Hazards

Algae Blooms

Landsat Missions (images from the Earth Observation satellites)

Geomagnetism Monitoring

Wildland Fires

National Water Dashboard

See also- 

USGS National  Map 

National Geologic Map Database

USGS Publications Warehouse and USGS Library

USGS data, web tools, maps, and gallery

National Hydrology Dataset

Earth Resources Observatory and Science Center