Ask An Earth and Space Scientist
Ask An Earth and Space Scientist is an educational resource for students, teachers, parents, and life-long learners. We encourage anyone interested in earth and space to make use of its content.
Today, the air we breathe has lots of oxygen – over 20 percent! But that wasn’t always the case.
The surface of lava can appear smooth, rough, jagged, and sometimes like a pile of construction rubble. What are the stories behind these surface features and how did they form?