The central theme of N.A.S.A.'s applications programme in general is to provide a platform for a broad effort to develop practical tools, predictive models and observational spaceborne and ground systems to further social and economic benefits to society. This programme should serve as a tool for and as a positive impetus to (a) realizing the equitable and efficient use and conservation of natural resources, (b) expanding the educational opportunities and medical services for all people, (c) providing new opportunities for exchange of information and lessening of international tensions, and (d) providing increased business and social communications between nations. The Earth and ocean dynamics programme is part of N.A.S.A.'s overall applications programme and consists in essence of two major parts; one dealing with the solid Earth and the other with the world's oceans. In this paper, the main emphasis will be placed upon the first, since this part fits best into the theme of this special session. Practical uses and applications of space systems, science and technology will be discussed. What are the phenomena to be observed, their state of the art and their possible future needs? For instance, the present state of tectonic motion determination is to estimate its average motion over millions of years. Our aim is to understand and determine these motions to say 0.5 cm/year over one or two years in order to help in the development of earthquake prediction models, to quote an example. Is there a correlation between the Earth's gravity and magnetic fields and what is its implication for earth resources exploration? The Bangui anomaly in central Africa is a good example. Large mineral deposits are associated with this gravity and magnetic anomaly.