Kotkin says that sprawl cities involved in material things drive economic activity.

FORBES: Suburbs Or Cities? Extraction Or Ideas?

It is one of the most important indicators of the SNA that displays the final result of the production activity both in material production and non-material services.

UNESCO: Belarus: Report: Part I: Descriptive Section

If granted the land would be protected in law from development or any activity which would cause material harm to it.

BBC: Tesco sign

It's unseemly to have commercial activity around human reproductive material.

NPR: Defining the Ethics of Stem Cell Research

Meeting the standard of material participation, and thereby turning an activity from passive to nonpassive, is obviously a critical consideration, for if an activity is passive, all of the income allocated to the individual owner will constitute net investment income under Prop.

FORBES: Overview Of The New 3.8% Investment Income Tax, Part 2: Passive Activities

Methane either can arise from microbial activity in shallow deposits of organic material, or it can come from more deep-seated processes involving oil formation.

MSN: Expedition finds 40 unknown gas seeps off US East Coast

Magnetic activity on the stellar surface could also be caused by accretion of material onto it.

MSN: Newborn star's 'heartbeat' seen by X-ray telescopes

The choice to play a game about known risks is not the same as a choice made when material information was intentionally kept from you from the entity that enticed you into the activity.

FORBES: Connect

Investors should be told because not only does such activity impact upon the investment results they receive, but it also is material to a determination of whether a manager maintains the ethical standards the investor seeks.

FORBES: Mutual Fund Personal Trading Illegalities: Letter to Barry Barbash, Director of Division of Investment Management, Securities and Exchange Commission (July 1, 1998)