A rock is dropped into an 89 km deep canyon on an unknown planet it takes 99 minutes for the rock to hit the bottom of the canyon find the acceleration due to the gravity on this planet

Excerpt from w. e. b. du bois jon reese 4 du bois was one of the first male civil rights leaders to recognize the problems of gender discrimination. he was among the first men to understand the unique problems of black women, and to value their contributions. he supported the women's suffrage movement and strove to integrate this mostly white struggle. he encouraged many black female writers, artists, poets, and novelists, featuring their works in his crisis magazine and sometimes providing personal financial assistance to them. the cause was that w.e.b. du bois encouraged many black female writers, artists, poets, and novelists. what was the result? think about cause-and-effect relationships.

How did the construction of the erie canal improve transportation in the united states in the 1820s? a. the canal connected the great lakes to the mississippi river. b. the canal connected the great lakes to the ohio river. c. the canal connected the atlantic and pacific oceans. d. the canal connected the great lakes to the atlantic ocean.

1.in which of the following ways did washingtons native people produce a minimal impact on their environment? select all that apply -built fish traps across rivers -harvested bark from trees -dammed rivers, altering salmon runs -logged old growth forests-filled in swamps-burned forested areas to increase plant diversity -tore down hills to make cities 2. which statement about groups interacting with the environment is true? a. settlers were careful not to affect the environment with their actions b.settlers were particularly concerned with conserving forest c. native people tried to balance their use of natural resources with their respect for the environment d. native people were careful not to affect the environment with their actions 3. which best explains how native americans in washington related to the environment? a. their dependence upon the environment led to over-harvesting, which used up many natural resources b.they did not fully take advantage of natural resources until settlers arrived from the eastern united states c.they relied on the environment for all aspects of their lives-clothing, food, housing, and transportation.d. they worked over the years to become less reliant on natural resources for their livelihood. 4.what is one way farmers in eastern washington changed their natural environment? a.damming of rivers b. excessive trapping c. irrigating crops d. logging old growth forests 5. how do people in washington interact with the environment today? select all that apply. -eastern washington is no longer used for farming -logging remains a big industry within the state -rivers are reserved for recreational use -people rely solely on cedar for building canoes -people rely on the rich farmlands of western washington for many crops