A local coal mine grows by 11 acres per year. How many square meters per day is this? As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and the cloud to be the other plate. The altitude of the cl...
The warming already in the oceans and in the air is committed — like a freight train in motion. So, no matter what, the Earth will soon see a summer with less than 1 million square kilometers of sea ice scattered in tiny bits across the Arctic. The big question is when the Arctic ...
During large geomagnetic storms, the aurora oval expands, and the northern lights can be seen in more southerly latitudes. However, this may happen on a much more limited frequency. In the U.S., Alaska is the only state under the aurora belt. Because the aurora is drawn to the earth’s...
What is the average precipitation in the tropical rainforest biome? How big is the biggest temperate forest on Earth? In what kind of place do tropical dry forests grow? How many square kilometers is the Amazon rainforest? What is the climate of a deciduous forest like? What is larg...
We can put at certain times of the day(每天花一定的时间), about 10 or 20 minutes,turning off Chinese and turning on English.;We can pick up a topic, imagining you are on stage(舞台) and the audience(观众) listening to you.;It's not neccesary to translate everything into Chinese.
Within the last 30 years, an enormous growth of aquaculture can be observed. Aquaculture, or aquafarming, is the growing of marine creatures from algae to big fish, like salmon, in closed underwater zones or cages, where the creatures are fed, protected from predators, and harvested. The aq...
Because the Earth is a large magnet with a complex magnetic field, these forces are moving all the time. The two poles are about 800 km (~500 miles) apart. The magnetic pole has moved about 1,000 kilometers (621 miles) north in the last 150 years, and it’s accelerating. ...
carpet of pumice particles that expanded to about 400 square kilometers—roughly the size of the city of Vienna. Now a diving robot was used to examine the ash deposits on the seabed. From theobservational datathe group of James White detected more than 100 million cubic meters of volcanic ...
Drone-assisted police work is already a reality in cities and towns across America, but has run into strong resistance from privacy advocates who fear the emergence of a Big Brother-like police state [source: Sengupta]. For the most part, police drones have been limited to search-and-rescue...
Therefore it wasn’t able to expand beyond the 4.9 square kilometers allotted to it. The extreme popularity of the destination and the limits on expansion means that the town’s limited real estate is extremely expensive and almost entirely devoted to high-end tourism. Nearly everyone who lived...