We know because we have found fossils (化石) in rocks (岩石) all over 1. ___ world. In the picture, the science workers 2. ___ (dig) dinosaur fossils carefully out of the ground. Then they 3. ___ (take) them to a museum (博物馆). At the museum, scientists will study the...
As we all know, the Earth's surface (表面) has many plates (板块). These plates are always moving. When two plates move past each other, the rocks begin to push against each other. After a while, the rocks break because of all the pressure that's built up. When the rocks break, ...
Every year, millions of rocky shards from outer space burn up in Earth's atmosphere, many briefly flaring and appearing in the sky as "shooting stars." But how many survive their high-speed plunges to strike the ground? Rocks from space that land on Earth are known as meteorites. Giant...
these are also extrusive igneous rocks. However, instead of originating from lava that flowed on the earth’s surface, tephra is volcanic material that was hurled through the air during a volcanic eruption.
The rover came attached with the most advanced set of scientific instruments. These instruments are capable of scrapping loose soil and drilling rocks on the planet to analyze composition and structure. Unlike its predecessors, this rover did not feature any solar panels. Rather, it had a radioiso...
Many climbers fell down and died. The mountain is very windy. Parts of it are covered with snow. Many climbers may get caught in snowstorms and become unable 14The mountain is rocky. Sometimes, during snowstorms, rocks might fall down along the slopes. Any climber,trying to go up the ...
①Many people are somewhat puzzled at the negative side of the voting, although some arequite happy with it, and active in doing it.尽管有些人热衷于选举,并且积极参与,但是也有很多人对选举消极的一面有点儿困惑。 ②People have long___how the Egyptians moved such huge rocks. 人们长期对埃及...
What eight elements make up the Earth's crust? How many tectonic plates are on Earth? How much gold is in the Earth's crust? How are most of the carbonate minerals and rocks formed? How much water is in the Earth's crust? How much water is under the Earth's crust?
How many Mars rovers have been sent to Mars? NASA has sent five rovers to Mars: Sojourner, Spirit, Opportunity, Curiosity and Perseverance. What are the 2 rovers on Mars called? The two rovers on Mars are Curiosity and Perseverance. How many rovers are currently on Mars? There are two ro...
Then, in the final step, a rock polish such as micron-size aluminum oxide is used to produce a bright, lustrous, polished surface on the rocks. The tumbling process usually takes a few weeks to complete in a rotary tumbler. Many people purchase rock tumblers to make tumbled stones as a...