Who pioneered the concept of the land ethic? Gifford Pinchot
George Bird Grinnell
Aldo Leopold
Theodore Roosevelt

Aldo Leopold.

Explanation: One of Leopold’s major contribution was to create and promote the "land ethic," the idea that concern for people and for the land they occupy must be intertwined.

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.

soviet influence spread across eastern europe sharply during and after wwii. the soviet armies liberated the countries in eastern europe and occupied them from the germans as they were forced to retreat towards germany.