Answer:
climate change threatens coastal areas which are already stressed by human activity pollution invasive species and storms sea level rise could be rolled and in coastal ecosystems and eliminate Wetlands warmer and more acidic oceans are likely to disrupt Coastal and marine ecosystems
The correct answer is: C: two and a half years. As a mater of fact, it started in May 1804 and lasted until September 1806. This expedition, also called Corps of Discovery Expedition was the first American expedition to cross what is now the western portion of the United States. Expedition was ordered by president Thomas Jefferson shortly after the Louisiana Purchase in 1803. The goals were to <span>explore and map the newly acquired territory, find a practical route across the Western part of the continent, and establish an American presence in this territory.</span>
Answer:
Photosynthesis and Organisms respiration
Explanation:
Carbon exchange is known as the Carbon cycle, In this cycle, the biosphere and the atmosphere are in constant interaction because of the different organisms that use carbon in some way. Plants are able to capture the CO2 of the atmosphere and transform the carbon to energy and oxygen through Photosynthesis. Also, plants liberate the Glucose produced in Photosynthesis to stimulate plant growth through a process called Plant respiration.
Photosynthesis exchanges about 120 gigatons of carbon per year and with plant respiration´s 60 gigatons of carbon per year they are the two largest exchange processes between biosphere and atmosphere.
Answer:
sorry if its too big.
Explanation:
U.S. immigration has occurred in waves, with peaks followed by troughs (see figure). The first wave of immigrants, mostly English-speakers from the British Isles, arrived before records were kept beginning in 1820. The second wave, dominated by Irish and German Catholics in the 1840s and 1850s, challenged the dominance of the Protestant church and led to a backlash against Catholics, defused only when the Civil War practically stopped immigration in the 1860s.
The third wave, between 1880 and 1914, brought over 20 million European immigrants to the United States, an average of 650,000 a year at a time when the United States had 75 million residents. Most southern and eastern European immigrants arriving via New York’s Ellis Island found factory jobs in Northeastern and Midwestern cities. Third-wave European immigration was slowed first by World War I and then by numerical quotas in the 1920s.
Between the 1920s and 1960s, immigration paused. Immigration was low during the Depression of the 1930s, and in some years more people left the United States than arrived. Immigration rose after World War II ended, as veterans returned with European spouses and Europeans migrated. The fourth wave began after 1965, and has been marked by rising numbers of immigrants from Latin America and Asia. The United States admitted an average 250,000 immigrants a year in the 1950s, 330,000 in the 1960s, 450,000 in the 1970s, 735,000 in the 1980s, and over 1 million a year since the 1990s.
Convection causes the movement of tectonic plates.
