The sudden shift during the COVID-19 lockdown from face-to-face to online teaching clearly impacted degree programmes in Geology characterized by a substantial practical teaching methodology. This study analyses the suitability of online teaching in the degree at Geology of the University of Barcelona by: (a) describing the strengths, weaknesses, opportunities, and threats (SWOT) from the point of view of online teaching and learning, (b) addressing two surveys to teachers and students to explore the consequences of online teaching on learning and gained competencies, and (c) analyzing pre-, syn- and post-pandemic academic results. Results show that both teachers and students value the learning resulting from online activities and the acquisition of new skills. However, some perceived that critical competencies cannot be achieved online, such as the field and laboratory work required for professional development. Moreover, students had difficulties maintaining attention and starting discussions, while instructors had difficulties properly monitoring students such as to control exam fraud, due to the lack of the necessary tools. Online teaching during the pandemic influenced instructors' grading of students and likely led to some leniency with grading, as teachers admit, consistent with the higher student grades and decrease in second-chance examinations in 2019-20. We conclude that in a potential new online or blended teaching scenario, the full acquisition of practical and communicative competencies is a key point that should be accurately managed in Earth Science degree programmes.