Which water conservation method is Jack using?

Jack has built small earthen dams in the furrows between the ridges on which he plants crops. Jack is using the ___ method of water conservation. This method conserves water by holding precipitation water between the ___ , allowing the water to infiltrate the soil and eliminate runoff.

the supermassive black hole is in the middle of the galaxy.

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.

the answer is c. altitude. hope this ! #brainiac